Evidence Alerts, a collaboration between McMaster University's Health Information Research Unit and DynaMed Plus, offers an email alerting system and a searchable database of articles that are pre-screened for quality and given a clinical relevancy rating.
Google Scholar Alerts
Google Scholar offers search alerts and citation alerts. You can also create a public author profile.
MedWorm is a medical RSS feed provider that compiles news from over 6,000 authoritative data sources. You can view the feeds many ways, by medical condition, specialty, top 100 articles, and more.
2 Minute Medicine
2 Minute Medicine is a physician publishing group from Harvard Medical School. Their reports review and summarize high-impact and current medical literature. Subscribe to free daily updates here.