quickSub
I was reading "Jon's Radio":http://weblog.infoworld.com/udell/, specifically a post wshere he talks about "Standards versus customization":http://weblog.infoworld.com/udell/2004/03/17.html#a946.
He talks about a few things in that post but his points about one-click subscribe for news feeds caught my eye. First, one-click subscription is a reality, albeit not a well-known reality. I noticed Jon had a neat way to allow readers to one-click subscribe to his blog. It turns out that his mechanism is publicly available and is called "quickSub":http://www.methodize.org/quicksub/. I was able to install this in 5 minutes.
My own aggregator "NewsGator":http://www.newsgator.com/ has another means of doing this via a neat IE plugin that squats down on your toolbar. Unfortunately, this toolbar doesn't work in my primary browser, "firefox":http://www.mozilla.org/products/firefox/.
Check out my syndication section of my sidebar and hover your mouse over the "one-click subscription" link.
Cool!