Sorry about the multiple posts today, but yesterday, I bought "U2: The Ultimate Encyclopedia". Its a really good book. It has loads of stuff in alphabetical order, from mentioning tons and tons of releases and gigs to their appearance in The Simpsons. UK people, it was only £5.99 in HMV. Probably because it was updated last year, and so is out of date with the latest album. At the back, it has lists of loads of things chronologically, like TV appearances, gigs, singles and collectables. A great buy.