So, I was trying to add a comment to Ayende's blog the other day, and discovered that you couldn't do it in Opera 9.51. He's also using some version of Subtext, so I started testing mine out. Sure enough, can't post a comment using Opera, but since there are only 7 of us using it, that's not a big problem. The bigger problem is that you can't post comments using (some versions) of IE6. It doesn't throw an exception like Opera does, but it basically never returns after pressing the magic button. Only IE7 and Firefox work reliably.
Since this is a massively low traffic site, I'm not sure when I'll get to fixing it. Could be my first official open source patch.