2011-08-06: UPDATE: now available from my drupal.org sandbox
google_gadget module is now available directly from my sandbox on drupal.org, at http://cvs.drupal.org/viewvc.py/drupal/contributions/sandbox/fgm/google_gadget/.
It should make it simpler to use than having to gather the pieces from my post explaining the module.
2009-05-24: UPDATE: now ported to D6
Having recently discovered the Google Gadgets API, and being on vacation this week proved too much of a temptation: I had to build one using Drupal. Here is a way to do it, as a module creating a Google Gadget to directly search http://api.drupal.com/ from the iGoogle home page. User preferences allow searching the various versions of the API and default to Drupal 5.