Jimmy,
I have an Mbox which makes things easy to explain given that there is only one i/o path, but I'll do my best to explain the Apogee set up on a digi002. Obviously, you want to set your clock source to the Apogee. Set up one of your digi002's i/o paths in ProTools to SPDIF and name it Rosetta. Run all of your audio tracks to an auxillary input as a master bus and out to your master fader (e.g. all audio outputs to bus 13-14, and bus 13-14 out to bus 15-16 which is what you have your master fader output set as). On bus 13-14, click on the inserts button like you would for any plug in, and choose i/o-->you should see your Apogee i/o path you created. This will route your master bus out to the Rosetta then back to your master fader, allowing you to apply UV22HR and utilize the Aptomizer function (make sure you enable the learn function on the master bus and let the Rosetta calibrate levels on your 2 channel mix...but don't forget to click learn again and turn the aptomizer on before you do a bounce). Finally, when you are ready to do a bounce to disk, make sure you choose bus 15-16 as your bounce source in pro tools in the bounce to disk dialog box where you are asked to choose the bit rate and so on. Alternatively, you could similarly route all of your audio to a stereo audio track and simply record a master track using the same type of set up.
Leon, from Apogee is supposed to be sending me some more information on this, so I'll let you know what he says. If you do order some OSA stuff I would love to hear your thoughts, as we have much of the same gear and I am considering the OSA route as well. Nathan's comments are well taken regarding the impact of gear as you move away from the sound source, and in fact I have read that same heirarchy at some point previously. I think the most often neglected is number 1, room treatment. I decided to wait on that since I am building out a dedicated basement studio early next year, with the exception of an auralex gramma for isolating my mesa. My thoughts on mic's, especially for electric guitar, is that a 57 and a C1 are completely capable...maybe not a royer and a U87, but certainly capable. This heirarchy led me to the LA-610 and I can honestly say that it pales in comparison to my Apogee as far as sonic improvements go. Comparing sessions done before and after, I am amazed. But ultimately, the proof is in the pudding as they say, and you should trust your ears. If you aren't hearing much of a difference, I would say ditch the Rosetta and get some Auralex treatment, new pre's, or a new mic. Again, I would love to hear your feedback on an OSA set-up from Nathan.