The Rat Genome Database has a disease portal. These portals offer disease-specific data and right now include cardiovascular, neurological and obesity/metabolic syndrome disease portals. There’s a cancer disease portal coming. If you go to the link, you’ll see they also have a short tutorial they added last month on the portal that has also been uploaded to SciVee (if you haven’t seen it already, SciVee is a community of pubcasts, or video casts of publications. Check it out).