Last month, in a blog post that I wrote called "RSS As Information Coping Tool" - experimented with switching some my listserv subscriptions to RSS reader. (Bloglines has this feature). It works in various degrees from gee whiz fantastic to that sucks!
If you're goal is to reduce the email clutter, but not read the listserv posts and still be subscribed - than listserv is a great method for not dealing with your inability to let go. Maybe the reason why you are not reading posts from that listserv and letting them accumulate in your email is that you're not really interested in the content versus being overwhelmed with email overload.
Makes sense to really think about whether an information source/listserv is giving you value or not. If not, unsubscribe!
With that said, listserv to RSS can help when you have many valuable sources. But, not all listserv RSS feeds are a like! For me, it works best when:
-listserv traffic is fairly modest
-the RSS feed picks up the sender's name and full text of the post
But let's not look to this a total pancea. Here's a great article from Dave Pollard called "When Not To Use Email" and if we each applied these ideas to our use of email - we'd cut down on each other's email clutter. Again, I'm reminded of David Shenk's work ten year ago - Data Smog. It uses the metaphor of pollution for information overload. There were some solutions in the end - like "Give a Hoot, Don't Data Polute." Dave Pollard's recommendations help you avoid polluting your own and other's email boxes.