Another possibility of RSS is syncronisation of sites. I think that the future step of physcomments (still a newborn, found. 1 Dec 2004) is to hub for other "Cafe" sites. The "cafe managers" could do active fine-tuning of discussions and to make independent, decentralised development of their sites, while thehubs could provide a condensed view, for people who does not like to navigate. RSS seems a obvious syncronisation tool (althought for small scale, email commands are adequate too). Another utility of RSS is that it is XML. Thus it fits well in XML->TeX converters, and "book versions" of a site can be more easily dumped via the RSS feeds. I will try to elaborate on it this year.