Wait a second. What do you mean "enabled third-party apps?" I thought it was "if you see it on the ipad you can see it on the screen"? Unless full mirroring is an ipad 2 only thing.
Mirroring is iPad 2 VIA HDMI ADAPTER ONLY. There's no Airplay mirroring for either iPad, not even iPad 2. Only playing of media off compatible websites and the aforementioned enabled third-party apps, which works with both iPads, and iPhone 3GS and 4.