How to Feed Twitter to FeedBurner

I tried adding my Twitter RSS feed to FeedBurner a little earlier.  Even though FeedValidator identified the feed as valid FeedBurner wouldn't.  Googling this suggested that either Twitter isn't producing nice RSS feeds (which FeedValidator's validation seems to contradict) or FeedBurner has blocked it.

I decided to try passing the RSS feed through another tool.  I considered using Yahoo Pipes, but then decided that the feed aggregator from XFruits would be the quickest way.  I set-up a feed as an aggregation of just a single feed, passed that to FeedBurner and everything now seems to work.