I'll take a look at the module for rss feeds and see if I can filter out the unapproved posts. The spam filters seem to be catching close to 00% of the unwanted stuff, I'm not sure why you're still seeing some.

I'm trying to patrol new user registration to block user-spam. I'm waiting for a new feature on the capcha module that will also help block this.

[ETA] I see the problem -- I fixed the normal recent changes but not the rss feed to hide spam. I'll roll out a fix tomorrow and you should see all the junk disappear... Thanks