A few weeks ago, I became the co-maintainer of the Porter Stemmer module for Drupal, which adds American English stemming to Drupal's core search functionality. (Stemming is the process of reducing words to their stems for better searching, so that for instance walk, walking, walks, and walked will all be equivalent in a search.)
I just published a new article on poplarware.com: Drupal vs. WordPress. It's a comparison of the Drupal and WordPress content management systems, aimed at helping the reader choose which CMS is better for which types of web site projects.
This module enhances the core search functionality of Drupal by indexing content as rendered by your theme, and giving you more control over which pages on your site are indexed. You might also be interested in my article on options for search in Drupal, which I wrote recently.