Hmmm, my personal blog (rvoodoo.com) does that. Well, not in the RSS feed, but on the site. I only implemented it like that on the one site, the others use a text/icon link. I set it up like that without really thinking, pretty much back when the formats were in Beta. I hadn't really even thought about it. But I can see the point here.... Luckily, I was just starting on a new theme for my blog, I'll be switching up how I handle links.