There is now a “mass spectrometry” tag at the del.icio.us “social bookmarks” site. Since a del.icio.us tag can only be a single word, the tag is “mass_spectrometry“.
Using the del.icio.us site, anyone can tag a web page with any number of tags. The tags can be sorted in various ways and displayed as web pages or newsfeeds. Here is an example of tagged mass spectrometry resource pages taken from a del.icio.us RSS feed using MagpieRSS and Feed2JS.