Just thought I would finally join since I've been reading and following this forum for the past 3-4 months.
I currently use my iPad "1" (being that the 2nd Edition will be available soon... LOL) primarily for music and creating sketches.
I've been using the AmpliTube for iPad , Songwriters Pad , Taylor EQ and the Guitar Toolkit amongst other similar app's to integrate with my digital workstation and as a portable studio/recorder.
In addition I use Sketchbook Pro and a few other drawing app's as well.
Other than that I also incorporate it into my professional job by using a few other app's.
Currently own an iPhone 4, 32GB and the iPad 1, 64GB, Wi-Fi/3G. both devices are encased using the OtterBox Defender series cases along with the AmpliTube iRig interface guitar module for the iPad.
Having said all of that, I must say this is an awesome site to come to for information and hope to keeping gaining more... maybe contribute as well