I was wondering what was going on, the old feed was behaving strangely in my reader. The new one works really nicely in inoreader.
I do get different behaviour in different browsers. Firefox, where I’ve an RSS extension, shows the RSS; Safari offers to open the feed in NetNewsWire RSS reader; Chrome shows the webpage.
Alan’s comment about pinboard is interesting, I used to have a sort of tumble blog running off the rss from my delicious links.