Josh is seeing previously-read feeds as ‘unread’ again in his aggregator. I too had noticed this, but presumed it might have been a glitch just with my account. Glad to know that it’s not just me.
Interestingly, it is only my own blogger feeds (I run a few blogs there) that seem to refresh themselves; feeds of other folks that I read don’t seem to have the problem. Perhaps because I tend to read them more than my own feeds…? My own blogger blogs often go for several months without posts and they are the ones that appear to refresh by themselves. Curious.