MedWorm is a medical RSS feed provider as well as a search engine built on data collected from RSS feeds. It collects updates from over 6000 authoritative data sources (growing each day) via RSS feeds. From the data collected, MedWorm provides new outgoing RSS feeds on various medical categories that you can subscribe to, via the free MedWorm online service, or another RSS reader of your choice, such as Bloglines, Newsgator, Google Reader or FeedDemon.
You can easily customize or tailor your search query to specific types of content (and categories), such as news, journals, blogs, podcasts, etc. Also, MedWorm has already indexed a wonderful collection of categories (e.g. Swine Flu), which can assist you to find what you want, as fast as you want (Not sure about that one, yet!). Cool!
If you think you can do better, why not create your own specialized search engine using Google Custom Search Engine. I heard recently that they have updated it with some cool new features, including more templates to personalize and tailor the look-and-feel (to what you want!). Why not :)