You've probaly all heard of Bloglines, the web based feed reader. As long as they don't turn in to an ugly monopolized 'will feed for cash' service, it is a very good idea. It takes some of the bandwidth requirements out of publishing a weblog, since they crawl your site only once regardless of number of subscribers, and then they do something very nice in their UserAgent string that they pass along as they crawl:

The Bloglines crawler includes the number of subscribers to your blog with each feed request, so you will always know how many Bloglines subscribers you have

Excellent idea! Some actual localized information. No shame in confessing to being Bloglines. Not the usual "We're Mozilla" UA strings that everybody else is using.
I'm adding a subscribe with bloglines link to my front page...