SpamNet
I've been trialling DeerSoft SpamAssassin Pro for two weeks now. For those unfamiliar with it, SpamAssassin is a collaborative spam filtering application that leverages the power of it's users to help fight spam.
However the DeerSoft plugin for Outlook XP does not handle the HotMail inbox yet and this is where my spam comes from. My novissio address is still shiny enough not to get any spam. But I don't imagine that will last for long!
Unfortunately the DeerSoft trial is only 14 days so I don't really feel I've seen it in action (although it did file a number of legitimate but likely messages as spam) and can't justify the $30.
However, reading Michael Alderete's weblog I came across his notes about SpamNet which is another collaborative spam filter and available as a free download. If it can access the hotmail inbox that would be great, otherwise I guess it gives me more time to play with this technology before having to commit and maybe pay for SpamAssassin.
The only downside is that it's only available for Outlook on Windows.

