Unfortunately, it's not as easy to evaluate sites as it used to be. And, although it is still true that the sites at the top of a list of search results are likely to be the most relevant, don't neglect the sites listed lower in the list, especially if you find that the ones at the top are commer cial. You can also get better results by being careful about how, and where, you search. Use directories like Yahoo or LookSmart instead of standard search engines, which don't have human experts to check what categories sites appear in. However you reach them, use sites that you trust.
Online databases are also good sources of information.
You can search them on the Web or through most libraries. Finally, when you are on the Web, look out for commercial sites that masquerade as informational ones. Always find out who is behind the site, and what their mission is. If any directors or board members are listed, check out their other affiliations. Look for any political, ideological, or commercial agenda that could detract from the site's credibility.