I'm taking this opportunity to up my rating for this plugin. I never stopped using it, even after giving it a so-so review, mainly because there is no real alternative, but also because I can see that my case is a little extreme. I have 250+ RSS feed sources and I don't have a mack-daddy server.
However, it was their support that has turned me. I use WP-Drudge theme on atlantatechblogs.com, and I review and edit every rss feed item that comes through, so I have a LOT of manual processes. One of those is inserting the canonical URL into the outbound link field of the WP-Drudge template. Completely manual.
At least it was, until Shirag from WP RSS Aggregator dropped me a few lines of code and then did the troubleshooting when it didn't work at first. Now it works flawlessly, and I have quite a bit more time on my hands.
Thank you for great support.