I'm pleased to report that I successfully completed both challenges I took on for 2008.
The A-Z challenge was a lot of fun, and I definitely read some books I would never have read if I hadn't needed a certain letter. One author I was pleased to find was Eva Ibbotson. On the other hand, I could have lived with reading Zola's Nana! Find my completed list here.
The TBR (to-be-read) challenge was decidedly less fun. There's a reason some of those books sat on my list for so long! But I did read 11 from my original list, and only one from my alternates (I decided Stephen King's The Stand was just way too long). Check out my completed list.
I think I won't try to do either of these challenges again in 2009. I'm still doing the 1% percent challenge (though I haven't made much progress yet), and I welcome any suggestions for new challenges to take on!