Peter wrote up an item on Nick's CrystalEye's RSS feed, and I have been enthusiastic about chemistry-enriched RSS feeds for some time. CMLRSS has the chemical data inline in the RSS; see DOI:10.1021/ci034244p, the use of CMLRSS in Chemical blogspace described here and here , and the CMLRSS support in Bioclipse .
Egon Willighagen (Wed,) studied this question.