HubMed - Medical Research Delivered via RSS
Now there is a new service called HubMed, an alternate search of the PubMed database that creates a custom RSS feed based on your search results. Simply click on the orange "feeds" button at the top rights and subscribe to the feed with your news reader (such as Bloglines). New results matching your search will be delivered to you as soon as they appear in PubMed.
Source: RSS in Government