Blogger.com Hack - Is There A Way To Categorize All The Posts In A Single Blog

I hope there are quite a few around here who use Google's, Blogger service. I have three blogs already using the service provided by Google, the Blogger.com. The reason I have that many blogs is that I do write-ups on various topics. But, those three blogs are not enough to properly categorize my blogs. So, is there any way in Blogger, or is there a hack for it, where by, at the time of posting, I can set it to a particular category, and when my blog is viewed, visitors can select a category and read all the posts in them.

I am using blogger too and also missed this feature that there is no categories to choose from, I got used to wordpress, but could not find anything like that on blogger, unless it would be a third party hack ? I would like to have this option too, but I think it does not exist, because there should be much more html files to publish if this option existed ?