The Red Pyramid - Rick Riordan

This Rick Riordan novel isn't about Percy Jackson or Greek mythology - surprising, right? And it's also a pretty hefty book, with a 514-page long hardcover version - shocking!
It's very good, though; it's all about Carter and Sadie, two first-person narrators and young teenaged siblings whose parents were excellent magicians who followed the Egyptian mythological traditions. And yes, Egyptian mythology and deities are involved - fun!
Everything takes place in the same world as the Percy Jackson series (you can tell by the passing references to the Greek gods), but in different locations. For example, a big chunk of the action takes place in New York City, but in Brooklyn rather than Manhattan, since Manhattan's under the control (or is it jurisdiction? I'm not sure) of gods other than the Egyptian ones. And if that wasn't a reference to Mount Olympus over the Empire State Building, I'm a lemur.
Oh, and I'm thinking that that world is in grave peril a lot of the time. Seriously, it's endangered by Hellenic pandemonium one week, and by Egyptian chaos the next - should I expect some Norse trouble in the near future? (I'd read that.)
In any case, I'll keep an eye out for the next installment of The Kane Chronicles.

The Last Olympian - Rick Riordan

In this fifth and final book of the Percy Jackson & The Olympians series, the war pitting the Olympian gods against Kronos and his allies is in full swing. The legendary (and legendarily powerful) monster Typhon has escaped and is wrecking havoc all across America; Percy finally reads the full Great Prophecy that's been hanging over his head since the first book; and eventually everyone - allies and enemies and everyone in between - converges to Manhattan for the Epic Final Battle.
Of course, since this is a final installment and there's an Epic Final Battle, deaths are a-plenty (which is only to be expected, really).
It was very good; as with the previous installments of this series, I found it hard to put down the book once I'd started it. So yes, I do recommend it; in fact, I'd even recommend reading the entire series. Come on, there's Greek mythology involved!

The Battle of the Labyrinth - Rick Riordan

Book four of the Percy Jackson series!
In this novel, Percy and his friends must continue their quest against the evil Titan Kronos - whose army is ready for the war against Olympus, and whose earthly form is practically fully formed. Also, the Titan's forces are ready to march on Camp Half-Blood and destroy it, but all they're missing is one little thing, a way to navigate the Labyrinth. Yes, Daedalus's Labyrinth still exists (or rather, lives), and like everything else associated with Hellenic gods it has moved to the U.S., where it's become a handy (if confusing and often lethally dangerous) way of moving about quickly.
Daedalus, his son Icarus, the (somewhat evil) king Minos, and their story are all involved in this story; and as the next war between the gods and the Titans approaches, our main characters (Percy, Annabeth, Grover, Tyson, etc.) keep growing, gain allies, and lose friends. Plus, is that the lost god of the wild, Pan, that the satyrs (including Grover) have been searching for for two thousand years? (Warning: this particular quest will feature a famous Thus Spake Zarathustra line.)
As with all the other novels in this excellent series, the tone and pace of this story makes it a joy to read, and the way the author plays with themes and elements of Greek mythology makes my inner mythology geek very happy indeed. Seriously, I'll start gushing about the sheer awesomeness of this series if I don't end this post now.

The Titan's Curse - Rick Riordan

In this third installment of the Percy Jackson & The Olympians series, the plot thickens. New demigods are introduced, and some of them leave; the war against Olympus gains momentum, and our heroes must cross the continent once again.
Also, part of Hercules' mythology and some key elements of the Titan war take center stage, as our heroes meet and need to work with Artemis and her Hunters. Oh, and did I mention we finally get to meet Artemis and Apollo?
As always, a fun read full of action, adventure and almost deadly hijinks.

The Sea of Monsters - Rick Riordan

The second novel in the Percy Jackson & The Olympians series is, like the first, very very good.
This time, the thirteen year-old Percy Jackson is accompanied by Annabeth (again) and Tyson - a very tall and ugly and socially rejected kid that attended school with Percy this year - and once again a quest! appears. Yes, it involves Grover. This new quest more or less follows Odysseus' odyssey, and by the end of the book the plot surrounding the eeeeevil titan Kronos thickens.
Now, I have to draw the inevitable parallels between Percy Jackson's series and Harry Potter's: in both cases we have a heroic but not perfect hero (Percy), who has an extremely smart female friend (Annabeth), a bit of a comic relief of a best friend (Grover), whose adventures take place at a specific time of year (during the summer), feature a magical location away from his parent(s) (Half-Blood camp), and... It doesn't matter. Because these resemblances in no way detract from the story's enjoyability.

The Lightning Thief - Rick Riordan

The first novel of the Percy Jackson & The Olympians series is very very good. No, really - I read it in two sittings, it's that good. (Yes, I enjoyed it very much)
If you've seen the movie, you'll easily recognize the first chapters of the book - except that you should visualize Percy as a twelve-year-old sixth-grader, and not the seventeen-year-old high schooler who took the lead role in the movie. Be warned, though: starting from Percy's arrival at Camp Half-Blood, all the details change, and a slightly different (but essentially the same) story is told from then on.
Apart from that, what is there to say? The story is a lot of fun to read, full of action and adventure and Greek mythology (wooot!). I can't wait to get my hands on the sequel!