Currently questions are added in a rapid pace to SO, so that new questions disappear very quickly from the homepage. It I want to see questions from my areas of interest I can do either:
- Go to the tagged/my tags page, but then I will see the questions only according to the votes
- Supply a list of tags "x or y or z", but it seems the list is limited to 15 or 20 tags.
What I suggest is to have categories as grouping of tags - the .net category , java category , web development category , etc. It can also help new users to locate questions from their area of expertise they can answer. We can decide that a category can contain between 5 and 20 tags in order no to have too narrow or too broad categories (numbers were given just for the sake of argument)