I'm also looking a book and starting to write my own stuff, none of which i'm putting on here as i'm hoping to get them published.
Just go to your local Waterstones or Library and have a quick browse... If you look on the net, unfortunately, a lot of the poems are simply on because they rhyme, although you do see the odd gem.
It depends on what kind of stuff you like, old, new, classical, humour, theres so much. The book i'm currently after is one written by British Comedians, but I'm not too sure of the name.