Filter looks cool and over time you're going to garner a lot of information about me such as what I like and don't like. That's MY data though so I'd like you to request that you allow me to export that data so I can feed it into other recommendation engines (e.g. Amazon, Netflix). Please can you provide that feature?
Also, needing a different usernames/password for your forums is bad. Please fix that. Its not like community server doesn't allow you to use other auth mechanisms. ideally I'd like to log into your site and your forums using my Windows Live ID which is what I generally use for everywhere I log onto places (e.g. Hotmail, Expedia).
-Jamie