Both of these books are funny, but like many books by comedians, they recycle a lot of material from their stand-up routines. If you like the performer, you'll like the book, but if you know the comedian's material well, you won't find much new here. On the other hand, if you don't like the comedian, it's unlikely that anything in these pages will change your opinion.
Rock This! by Chris Rock - My wife's favorite comedian is Chris Rock so when I saw this in the Borders bargain bin, I had to get it for her. It was a perfect gift because I knew I'd enjoy it as much as she would (although I bought it for her, I'm including it in my "acquired" count since I read it). It's hilarious, as one would expect, but to someone who has seen all of his HBO specials over the years, it sounds awfully familiar. Rock This! is even written in a stand-up-like format with lots of short paragraphs (i.e., pauses between lines).
Yeah, I Said It by Wanda Sykes - I haven't seen as much of Sykes' stand-up, but according to Amazon.com reviewers, this book reuses a lot of jokes, too. At least Yeah, I Said It is formatted more like a regular book. It helps to imagine Sykes' voice while reading (even if you haven't seen her comedy routines, you may have seen her acting on The New Adventures of Old Christine). Yeah, I Said It is occasionally political, so right-wingers will undoubtedly be offended.
Current tally: 75 books finished, 68 books acquired