See, I really want it in comments. I used to never mind typing out the code for a username, but these days I'm so used to Twitter's way of doing it I tend to not bother when typing a throwaway comment, so I just type Az/'Fey/D/whatever assuming who I'm talking to will know what I mean.

This is incredibly lazy, and I don't like it, but...

So while I wouldn't mind it not being in the HTML editor (but I would like to see a highlight/insert code in there actually, is that already planned, really ought to check these things), I really want it for comments, which is wher eI think it's most useful anyway.