I always kinda thought that Terry Pratchett was just a cheap Douglas Adams wanna-be... I do own GOOD OMENS, but hat to me is a Neil Gaiman book...

Anyway... I'm off topic here... ya wanna good Harry Potter web site/communtiy...
copy and paste this addy to your browser...
http://www.fandom.com/harrypotter/

There'll you'll find a great community, and lots of info regarding the books, the movie, ect ect ect...

;-)