I think I read "Hallows" in the space of about 3-4 hours, which is about how long it took me to get through "Phoenix."
It's only natural that there should be a Wiki for Harry Potter - you've got one for the Muppets, one for Star Wars...so why not Potter? They're just very well-written, imaginative books, and that's what attracted me to them in the first place.
I started reading the books just after my 14th birthday, which was just after "Prisoner" was released in '99, and I've been a fan ever since. But I still remember the days when my brother and I would get into arguments over whether the books were good or bad. (but he's a fan now - I've seen him perusing the fan sites, and sneaking a look at my copy of "Hallows.")