* If you have found at least one sight which you find useful, find out what are its key words using Lycos or some other engine that enables you to do that, and search again using these words (the key words of a sight that interests you might give you a pretty good idea about the key words defining similar sights).
* Some engines (like yahoo, Lycos etc.) enable both Menu Based and Key Words Based searches.
On their results list, these engines usually detail the subject a certain issue is connected to.
Knowing the category of an item might be very helpful, since it gives you a new place to look for other useful items.
