I have couple other issues for RSS feeds (particularly blog entries):
1 - many feeds I see have traffic leaks on them. Often the permalink or story link does not have the full affilliate code on it. That can be a real issue, because using feedwordpress can lead to having the headline linked without the affiliate code.
2 - Not all types of media are easy for feed processing programs to handle. Video inserts (especially youtube style) just plain don't work most of the time.
3 - If you run multiple feeds or multiple sites, don't release all your new posts with exactly the same time and date stamp. Stagger your posts over the whole 24 clock! if two of your feeds are being used together, your posts will end up all together, which isn't all that attractive.
3a - if you are making multiple posts on the same blog feed, spread them over the day and week as well. 7 posts all with the exact same time and date isn't a weeks worth of updates, but rather a major waste of your efforts.
Good luck to everyone
