HTML tags haven’t been working in comments for a while. Prompted by Andrew Reynolds, I checked and found the problem was a plugin, which I’ve disabled. So you can all go back to including hyperlinks, as well as bold and italic tags. Just part of the friendly service.
I’ve also switched the RSS feed to provide the entire article rather than just the summary. Some people wanted this, and it seems like the way of the future, but feel free to discuss.