Buy the GC.com App. It allows you to download a PQ right from the wireless connection. While in the wireless you may have to save caches individually to have all the cache info but it works great. Plus you can make field notes and submit. When you get back into wireless you can push directly to GC.com and no more logging it’s all done. Plus many other good features.
Funny you ask, I also just received an I-Pod Touch. If you download the Geocaching app and run a PQ while connected to wifi they will be put in the saved section.
If you just want to add one or a few caches while connected to wifi, search which caches you like and on the cache page click add to favorites. Then when offline you can view the cache page in your favorite section.