Okay, I'll start.
Year's Best SF 7, when it cost $0.00
The Halloween Bundle, including the following by Kim Harrison:
Dead Witch Walking
Every Which Way But Dead
Good, Bad, and the Undead
Fistful of Charms
Dates from Hell
Perdido Street Station, by China Mieville
I already have the first four books by Kim Harrison in paperback, but I might be more likely to read them sooner if they're on my Reader. And I've bought and returned Perdido twice already, wanting very much to like it, but being put off by the gross-out factor. As my taste seems to darken over time, I may be ready to try it again. I've thought about what that says about our culture, or the genre, or about me.