For the past few weeks I've been using - and loving - a beta version of our iPhone RSS reader, and according to our mobile guru Kevin Cawley, the new version went live last night. The updated version is even faster than before, and has some really nice additions.
My favorite improvement is how it's smart enough to return to your list of feeds after you mark the last item in a feed or folder as read (I'm a fan of anything that saves a click, especially on a mobile device). And I love how articles I clip on the iPhone reader automatically show up in FeedDemon's synched clippings.
If you're looking for a great RSS reader for your iPhone (or any mobile device, for that matter), give it a try at http://m.newsgator.com/