W3C Feed Validation Service with SOAP
Do you remember to check the validity of your feeds every now and then, preferably after each new post you make? I know I sometimes forget. Errors in your feed can lead to it not being parsed by certain feed readers, as noted in IE7 will only support well-formed RSS feeds. And you probably don't want that to happen.
The Feed Validator for Atom and RSS that Mark Pilgrim and Sam Ruby created has been online for a long time, but it is now also available at the W3C website: W3C Feed Validation Service. Of special interest to developers of software that create feeds is that
The W3C Feed Validator exposes its Web service as a SOAP 1.2 interface, which you can use in your own applications..