eXtensibility and convergence
It looks like people are starting to wake up to the notion that XML is, well, extensible. You don't need separate syndication and archiving formats. You don't need separate syndication and display formats. The most extreme example I have seen to date is still this one - a blog that validates as RSS.
My weblog validates as XTML 1.0. If recommendations emerge as to CSS class names for aggregation purposes, I will comply.