StudentHacks.org recently published a list of 101 Web Resources for Students. The list was written by a student who has actually used the resources in his own studies. If you're learning online, you may want to take a look.

Included in the list are almanacs, biographies, dictionaries, encyclopedias, journal article databases, style manuals, year books, and more. You may also be interested in their list of Google Gadgets for Students.