I can't resist adding these extra free resources:
From India comes Open J-Gate, a great open access journal database, in which all articles are freely accessible. It appears to cover many disciplines, and they say that content goes back to 2001 and indexes almost 4,000 journals. check it out here.
Stanford University's Highwire Press offers several scholarly journals for free, often -- but not always -- after an embargo of 6-12 months. See check it out here.
The American Museum of Natural History offers free access to all of its journals. This is 4 journals back to the beginning of the journal run, which is at least 1921. check it out here.
SciELO - Scientific Electronic Library Online -- was "conceived to meet the scientific communication needs of developing countries, particularly Latin America and the Caribbean countries." To that end, it offers free access to almost 300 journals, most of them without an embargo (i.e., up to the present issue) in many sciences & social sciences. See check it out here.
Finally (for the moment), if you like psychology as I do, check out the Psychonomic Society, which offers free access to its 7 journals, from 1991-2000. check it out here.