Prepare to Die by Paul Tobin

Despite being at their mercy, Steve Clarke, aka superhero Reaver, is inexplicably given a boon by arch-nemesis Octagon and his cadre of supervillains, Eleventh Hour - instead of killing him outright, they grant him 2 weeks to take care of his affairs before he reports back to them to fight to the death.  Steve uses the two weeks to come to grips with how he became a superhero in the first place, the loss of superfriends, his own moral ambiguity at times, and to reunite with his high school love, the girl who got away (or was pushed away due to Steve's unanticipated mutation caused by a chemical spill which transformed some of the cars occupants and killed others).

Insurgent by Veronica Roth

Sequel to Divergent

Tris, now on the run as war erupts, attempts to figure out what information is so vital, or so dangerous, that some factions would destroy others just to contain it.  

Divergent by Veronica Roth

In dystopian Chicago, society has been divided into 5 factions, each dedicated to cultivating a certain value:

• Amity (the peaceful)
• Candor (the honest)
• Abnegation (the selfless)
• Erudite (the intelligent)
• Dauntless (the brave) 

Scarlet by A.C. Gaughen

The early days of the Robin Hood story, told from the perspective of "Will" Scarlet.  Known to Robin, John, and a few others as just Scarlet, she is a young woman posing as a young man after running away from an arranged marriage.

Ready Player One, by Ernest Cline

Lots and lots and LOTS of geek and pop culture references from the 80's, as a teenage boy and his cohorts/competition attempt to solve puzzles in an online game that will determine who controls the internet in a futuristic society that lives mainly online.  Full summary from the publisher after the break.  Good for advanced teens and adults interested in the tagged subjects.  2011.

The Agency: A Spy in the House, by Y.S. Lee, Bk 1

The False Princess by Eilis O'Neal

Nalia spends the first 16 years of her life thinking she is the princess and heir to the throne of Thorvald, only to be told that she was only a decoy, switched at birth with the real princess to try to avoid a prophecy made during the queen's pregnancy that the princess would be murdered horribly before her 16th birthday.  The king and queen, having averted their real daughter's death, send the false princess, named Sinda at birth, unceremoniously away from the castle to live in a small village with her only living relative, an aunt who is less than delighted to have a fully grown niece with no domestic skills sprung on her with no means of support.

Paranormalcy, by Kiersten White

One in a spate of paranormal-themed YA books, this one held my interest more than many of the others I've read lately.  Evie is a teen who has been fostered with the International Paranormal Containment Agency since she was 8 years old, working for them during that time as the only person able to see through any glamour from any paranormal.  It's not breaking new ground in terms of content or teen angst, but it does have some nice "surprises". 

Only the Good Spy Young, by Ally Carter, Bk 4 in the Gallagher Girls series

In the previous three books in the series Cammie aka Chameleon Morgan has found out how serious being a Gallagher Girl is.  In the beginning it was fun knowing that she was a spy-in-training, sneaking out to meet a townie boy in Book 1 and using their special skills at detection, evasion, invention and deception to learn more about the mysterious boys from Blackthorne Academy in Book 2. 

Incarceron, by Catherine Fisher

Finn is a "cell-born" member of a Scum gang in Incarceron, the living prison with millions of electronic eyes and torture chambers, designed to recycled and re-use everything, even the people who are imprisoned there.  Finn remembers nothing before waking up in a cell, apparently remade from DNA of others who died, but his flashes of memory of the outside world convince him that he belongs outside.

The Disreputable History of Frankie Landau Banks by E. Lockhart

Frankie has her growth spurt and discovers leave-in conditioner the summer after her freshman year in high school, and when she gets back to school, boys seem to notice.  In particular one boy, Matthew, whom Frankie begins to date.  But Matthew and his friends are part of a secret society, the Basset Hounds, and the society doesn't let in girls.  Frankie, frustrated at being underestimated, impersonates the Basset's leader, organizing increasingly daring and successful pranks on campus, but pulling off brilliant pranks while letting someone else gets the credit rankles, and ultimately she has to come clean.  There are elements of romance, but ultimately this story is about Frankie and her growing realization of how being female effects how others see and treat her.  It doesn't have a "happy ending" in that Frankie does not end up with the boy of her dreams, but she does recognize her own self-confidence, worth and sense of power.