There are a lot of RSS readers out there, but since I have little requirements I just stick with reading my RSS feeds in Apple Mail. A few weeks ago the products of Newsgator got my attention.
The application for the Mac looks pretty standard. Multiple feeds organisable in folders, three panes, the usual. The two things I like a lot after using it for a few weeks are the a build-in browser so you don’t have to switch back and forth between your browser and news reader and the support for HTTP digest authentication which is used by Livejournal to gain access to the feeds of livejournals including the protected posts (if your LJ account has access to those).
The iPhone application is okay, haven’t used it that much.
But the good part is, besides the fact that these are both free applications, that they sync with each other via a free account at newsgator, so when I read a post on my mac the same post isn’t marked as unread anymore on my iPhone and vica versa. They also provide a web-based RS reader when you login to Newsgator which is a nice extra which I probably won’t use. It only seems usefull when I have some time to kill somewhere when I’m around a computer with internet access and without both my laptop and phone. But it’s a nice extra.