Google announced last week that they were upgrading the Google Site Search product to include on-demand indexing. In previous versions of the product, when you added new content to the site, you had to wait for Google's algorithm to kick in and re-index, a situation many customers were not happy with. The newest version enables you to click the "Index Now" button whenever you add new content, giving the site owner complete control over the indexing process. Article [1]
Links:
[1] http://www.daniweb.com/blogs/entry3524.html