Wow, I've played with these types of tools for a couple of years now, but I tend to stick with what works for me, and thus haven't even heard of about half of these, but David Rothman put together a nice page showing default output for nine different tools that allow RSS to be output to another location. Do note that at least some of these could be tweaked to look prettier if they weren't all on the same page... In the comments section of David's original post introducing this page someone pointed out a very large ppt presentation Michael Sauers has on this same topic.
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