I've not seen it discussed, and it seems like one of the best solutions right now for the ATV2. aTV Flash (black) - original aTV Flash is for the 1st gen ATV's - apparently gives you the ability to surf the web, playback additional formats not supported by iTunes and also includes Plex, among other features.

It only works for iOS 4.1, so everyone who's upgraded to 4.2 will have to wait, even if you're already jailbroken. For those who haven't upgraded, however, you can install with either Windows or Mac.

(hint: Best Buy, or whatever local store carries the Apple TV in your area, should allow you to return items within 30 days... If you have the extra $100 to spare for a few hours, you could downgrade your Apple TV quite easily...)

I wanted to see if anyone here had tried aTV Flash black yet, and if it was worth the price?

Here's a blog post from FireCore, who makes aTV Flash, about the new version for ATV2: Now Available - aTV Flash (black) beta | FireCore