Jon Scalzi wrote a series starting with "Old Man's War". A book about how mankind is colonizing space without the knowledge of the planet using retirees in new bodies. Fuckin hilarious and action packed.
The series is three books long, including "Ghost Brigades" a book about a group of soldiers grown from the DNA of other dead soldiers. Super cool. They run from planet to planet fighting all manner of disturbing and hilarious creatures.
The third book, "Last Colony", is about a couple of the soldiers from the first two settling a planet in deep space., raising kids, starting an interstellar war, and farming. Funny as hell.
Another classic, and a must read, Sci-Fi writer is Robert Heinlein. He penned "Starship Troopers" (Which Hollywierd butchered, btw. I mean, butchered. Horribly. May they burn for it) and about 30 other books that are page turners.
Both Scalzi and Heinlein are satirical, witty, and write stories like no one else in their field. If you like Sci-Fi you have to read these two guys.
