If a site has an RSS feed, it’s becoming standard to stick a link to it in the <head> section of the webpage, using markup like this:
<link rel="alternate" type="application/rss+xml" title="RSS" href="http://corky.net/dotan/log/index.rdf" />
Apparently, I deleted that markup when I re-did my site. Oops. I should fix this sometime.
It’s easy to find that link if you’re using Mozilla and have set it to show the Site Navigation Bar (look under View > Show/Hide). It’s easy to get at with Javascript on Mozilla (and probably on IE6 too), the only question is, what to do with it?
Well, Radio Userland has a feature which let’s you subscribe (in Radio) to an RSS feed by clicking a link (the standard icon for that is an “XML Coffee Cup”. 
Other aggregators (like SharpReader, which I’m using now) support this feature, or similar methods. There’s an online service that acts as an adaptor, letting you subscribe with a click through any of the methods it knows.
Here’s a bookmarklet (favlet? nah.) that can find the link markup and subscribe to the RSS feed. There are two versions, one for the XML Coffee Cup protocol, and another for the adaptor service.
Update: apparently, Marp Pilgrim already wrote pretty much the same thing, except his code is a bit more anal. It’s not as if this is hard. If my stuff doesn’t work, try his.