Some Webmasters have recently noticed a change in the number of pages that were indexed by Google of their sites. A WebmasterWorld thread shows a few that noticed positive changes after doing these three bare minimum things;
1. 301 redirect from non-www to www.
2. Removed any search engine specific pages, focused on user only.
3. Submitted Re-inclusion request.
Some have done the same three steps but have not noticed a change in indexing behavior by Google. See our continued linked coverage of these changes at Google here.
Forum discussion at WebmasterWorld.