Blog management

I'm using the blog on my site for everything I like to add there. But then I would like to subscribe my blog in planet smalltalk. For such meta blogs the mixture of things is not wanted. So how would you solve this? I could have a blog per topic or at least one for things being smalltalk. Then I only need to tweak post ticker component to include more than one blog. I would rather use the opposite approach. I like to put everything in one blog but have the ability to filter the posts by tag or anything else. This might make the subscription Url more ugly. What do you think? Norbert