Weblogging Standard?
You know what we need in Roller, MoveableType, Radio, Blogger, etc. is a "standard" for our data stores. How sweet would it be to be able to move your site from Roller to Radio without writing an import/export tool. The quick and dirty solution is to write a bunch of import tools for Roller, but the best idea is to unite the weblogging community into creating a common database schema, or whatever it may be.