Thanks. I'll give updating a try...
But why then does the feed work for everyone else except this one aggregator? I have a feed for the blog set up with LiveJournal, and it still works (as in new posts show up), two other blog aggregators still show my new posts as i make them, and if someone subscribes to my blog's feed, it works there too (at least, it does for me - and yes, i subscribe to my own blog's feed).
And as i said, this was working fine up until i moved the blog database to the new hosting a few weeks ago. So i'm not certain it's a WP issue and maybe something that went screwy with the database import? Altho wouldn't that bugger it up for all feeds from my blog?