Still requires subscribing to each feed individually, but as far as reading goes, I recently switched to reading my feeds in NetNewsWire--I have all the Cycling74 fees in their own folder, and that allows me to read them as a group. Makes reading them all easier, but is no help for subscribing to all at once. I'm sure many RSS readers allow you to do that.
Ah yes. I used to use Mail.app, but seeing as I sometiems read the forum from my desktop, laptop, public computers, or my iPhone, messages I had read would pile up in my Mail.app feeds. So I went back to just browsing the forum. Now that it is harder to see which new posts I haven't read on the new forum I decided to go back to RSS. I find NetNewsWire nice because it syncs with Google Reader, so I can read them in the NetNewsWire on either of my comptuers, my iPhone, or someone else's computer via Google Reader and it all stays in sync.
Another neat feature of using this app is that if I click the post title in the feed, it opens a browser tab directly in the app so I can read related posts or post a response all within the same application as I'm reading the feeds.
And no, I don't work for them, just really pleased with my new forum reading strategy :)