Searching for a particular information on the web has become a daunting task. For fast and better results users should have proper skill (search keyword and parameters) and the right search engine. In this light, I find it very useful to point to the Molecular Biology Database Collection - a collection that is updated annually and published in the journal Nucleic Acid Research. It is a very good starting point.
If you have web access follow this link (http://nar.oxfordjournals.org/cgi/content/full/gkm1037/DC1/1)