The comments area has been improved (hopefully!) today. The form has been moved to below the comments (people have emailed me to mention it is inconvenient to move back to the top of a page in order to reply), and a live preview feature has been added, including live previewing of favatars.
I don't know why, yet, but the site appears to be flaking out a little in Firefox. I am working on ironing out these glitches though, so don't worry, normal service (such as it is) will resume soon. (Update - Firefox bug fixed).