This seems an excellent proposal - it looks like they've really thought through the update-feed production side, as well as it being a good format for the consu

This seems an excellent proposal - it looks like they've really thought through the update-feed production side, as well as it being a good format for the consumption side. The idea of doing this in a cron job (or equivalent) means that most feed-producers should get immediate resource savings... It would also be interesting for sites to put a smart http proxy/cache in front of their RSS feeds; the cache could itself use SUP to invalidate old entires. So even RSS clients that didn't support SUP would get the benefit. Might really help the likes of Twitter...