Found this neat snippet of HTML code on Slashdot today:
<LINK REL="alternate" TITLE="Slashdot RSS" HREF="//slashdot.org/index.rss" TYPE="application/rss+xml">
If you have a relatively new Firefox (1.0rc will do nicely), Firefox will act as an RSS aggregator by creating a virtual bookmark folder. It's kind-of neat. I expect that the RSS planets out there will start using it.