PubMed Central and Medline

To limit articles in medline to articles only available in PubMed Central, do a search and add PMC (articles in PubMed central have a ID number that starts with PMC) For example: thalidomide and pmc. However, some articles are not yet available in PubMed Central. In this case it will say [Available on 12/15/09]. So, if you want only the ones that you can see right away, you can do: thalidomide and pmc not [available. it's a little bit complicated but it should work.

MaximumPC magazine

MaximumPC is an online computer magazine that is about PC hardware and software. It is published monthly and can be accessed for free.