I'm in the process of switching my RSS feed over to FeedBurner.  In doing so there will only be one feed for my blog.  I think most, if not all, just subscribe to the main feed so this may not be a big deal.  If you do subscribe to a specific category please let me know and I'll be more than happy to work out a way to keep the category feeds alive.

Also, when I do make the switch you shouldn't have to make any adjustments to your subscription.  Your aggregator should pick up the change immediately.