In the end, I chose to do it the old fashioned way - by hand. I created a bunch of articles named "Category: something", and I update them manually, adding links to new articles by hand. Then I simply create links to them - in this case in the top menu.
Since this is not really my idea, I won't go into details, but there's a really nice and long list of all possible category hacks for Blogger here at Freshblog. Enjoy.