Feedshare is a free web service which allows you to publish and share publicly any RSS feed or OPML file (a collection of RSS feeds) for everyone to check and subscribe to.
You can also discover, search and explore other interesting RSS feeds by keyword, author or tags or by the most popular ones: http://www.feedshare.net/popular/
Free to use.
Added to Content Discovery Tools directory here
Phi Beta Iota IO Tools (List & Links)