Ah, now this is complete bliss... I'm writing to you straight from within MacVim using the blogit.vim script. Up until now, the best way I could use Vim to write up on this site was to use MacVim's great little feature of hacking Cocoa to allow you to edit any NSTextField natively within the MacVim session. But now, I can just write straight within MacVim and then publish directly from here.
I owe a big thanks to Romain Bignon for this one. Excellent plugin!