The following site was just posted the the Severus_Snape_Is_Hot email list; not sure how long it's been around, it seems to be fairly new:
http://myhogwarts.co.uk/

It's described as being an online site for Potter fans by Potter fans.

Here are some of it's features:

myHogwarts Library:
     Read and write your own books for the myHogwarts Library.

Wizard ( Read more... )