For anyone who attempts to maintain a valid XHTML site, you know that it's a fair amount of work to make sure your site is valid all the time - especially if you're linking to other sites. You learn to hate ampersands (&). To solve this problem in Roller, I think we need a validator built into the posting of new content. It'd be a sweet feature, maybe we can start with a dirty URL cleaner such as the Hivelogic URL Cleaner. Further comments on this topic can be found at web-graphics.com. Interesting tidbit from Dave:
Better yet, if you use IE for your posts, you could do the same thing using its built-in XML parser.