Validate RSS feeds and OPML files
Wanna validate your RSS or OPML but don’t know where? I got some links for you;) Try validator.opml.org for your OPML files. And if you want to validate RSS you could check out feedvalidator.org, w3.org or Dave’s validator at scripting.com. That’s all folks!
The other easy way, if you happen to be a bloglines subscriber, is to subscribe to your own feeds. That way, if there is any kind of error in your feed, there’ll be a prominent red-colored clickable exclamation mark next to the feed name, and when you click it, you’ll get to know what is wrong with your feeds. A very nifty feature from bloglines.