Clearspace has search feeds already! You can find them by doing a search and then your modern browser (IE 7 / FF 2 / Safari) will show you a link in the address bar to the feed. A sample:
I like when that happens. Please feel free to implement our other suggestions before we ask for them.
Seriously, though, I had looked for a "subscribe" link, but didn''t notice the RSS icon in the address bar. Especially since RSS is a bit new for many folks, even techie folks, and search RSS not standard everywhere, my suggestion is to put a banner on that page telling people that they can subscribe to the feed.
Even Google puts both the icon and links in the sidebar: http://blogsearch.google.com/blogsearch?um=1&tab=wb&q=clearspace
My other suggestion is to cut about 3/4 of the detailed feeds each Space has, or hide them under an ''advanced'' hidden div. There you give too much detail and it scares me, so I can only imagine how it would scare an RSS newbie.