I should make something that's even more automagic than that, a feed parser which simply takes a feed and converts all the links to be mobilized through Mowser and produces yet another feed which can be used on phones that have support for feeds - it'd be a power-user feature, but something I can imagine a few people really liking.
I'll post a link here when I get it working. Stay tuned!
Here it is, just add this URL in front of your feed: http://mowser.com/f2m/ . So for example, a feed of del.icio.us's popular links would be: http://mowser.com/f2m/http://del.icio.us/rss/popular/
(Do me a big favor and don't subscribe to that link above in a regular news reader, hey? Just for phones and devices. I don't need a billion bots banging away at Mowser for no reason after you mess with the link, and then forget about it. Thanks!)