1. Total number of books I have owned.
Lots, but not as many as I thought I would've by now. Far too many are by the same authors and I have read far too much SF.
2. The last book I bought & 3. The last book I read. (I've updated this one, I read it over the last week 07/06/05)

Cycling to work doesn't give me as much time to read, besides I've got Spanish homework to read now, but I'm not counting that as a book.
4. Five books that mean a lot to me
The Hitchhikers Guide to the Galaxy, This book has had far too much of an influence on me, far too much, but I wouldn't be who I am without it.
The Owl Who was afraid of the Dark, My favourite bedtime story as a child, or at least I like to think it was, it probably was something else but my memory's not fact, they just a personal version of my past.
The Songs of Distant Earth, Arthur C Clarke actually has stuff in his books that's like real science. I just loved this story when I read it, I didn't know he could be so sentimental. The four Rama books are damn good too.
Armageddon the Musical, Robert Rankin has written a lot of books, and tends to repeat himself so once you've read three or so you've read them all. The Armageddon trilogy had me on the floor laughing first time I read them, but second time it just wasn't that funny, very much unlike Douglas Adams who always makes me laugh.
The London A to Z, Where would I be without it. Lost probably, although that's up north I think.
5. Tag 5 people.
Don't want to... but thank you for the meme George.