Posterous: Analytics (yay) - Tag RSS (boo)
Posterous has recently added support for Google Analytics, making the service instantly more valuable. Not that I strictly need this myself, but I do find the stats fascinating.
Sadly though, I just discovered that the blog does lack one important feature I had assumed it would have: RSS feeds for each tag. Being able to filter content by tag is tremendously useful, and I can already see from my analytics that people do filter my content. The Torchwood tag seems the most popular. I also like being able to filter just the photos. It would be nice to syndicate content in this way.