Mashable has put together a huge list of RSS Tools which includes:
Have a blog or other site that outputs an RSS feed? Want more exposure for your site or feed? Masternewmedia has compiled and regularly updates a list of websites where RSS feeds can be submitted. Each link has been tested and there is information on the website and how it works, as well as a direct link to the feed submission page.
Need a standard feed icon or a feed icon PSD so you can manipulate how the icon looks?
Mozilla Foundation has made RSS feed icons available to help feed links become more recognizable and standardized. Their guidelines and FAQ provide full information on the icon and how it should be used.
Back in December 2003 I put together an RSS primer called What is RSS? Lots of people have linked to to the resource as it is a fast and easy way to introduce RSS to website visitors. The content has been revised a couple of times but there have been many requests to extend the content to provide more comprehensive information on RSS. Although many web users understand what a feed is or at least what it is for, there are still many who do not or could learn how to make better use of feeds.
Thats where this blog comes in.