for example, use the search "irc site:digsbies.org". as it turns out IRC is a bad example for this because there's a page about the IRC channel, IRC stats, etc.
might be a good idea for Delirium to modify the custom google search to add site:digsbies.org by default to make that more useful (as it is, it's just a regular google search framed by the digsbies.org site).
you can also search this forum for whatever feature you want and once you find the "main" thread for that feature you should be able to find a post by eia or Delirium that links to the feature request page on digsbies.org.