I pad 2 artist tablet app?

You need to clarify what you want a little bit. Are you asking about a drawing app for the ipad (there are many) or about being able to use the ipad as though it were a wacom tablet for your mac?

Well, the thing is that the ipad is not pressure sensitive the same way a regular tablet is, and that's been kind of problem to work through, but there are some apps that are trying, like mobile mouse/trackpad. I don't think any of them are really there yet.

http://itunes.apple.com/us/app/pad-mouse-remote-trackpad/id363573369?mt=8

Go for a Wacom tablet. I have been using them for 20 years. The iPad while great, is not an artists drawing tablet.

Well, I'd have to agree with that. If you can, go for the Intuos over the Bamboo--the angle sensitivity is worth the extra money. You don't need a large one unless you draw with large sweeping strokes.

If you want something to doodle on and don't mind the limitations, check this out :

http://www.myboogieboard.com/uses/drawingartist.html

It allows you to not only use your finger, a stylus but you can also use a brush or other things that can draw.. Supposedly the screen is super sensitive.. Unfortunately, you can't save your work but I heard they're working on another version that can.. It's only $30.. I'm tempted to put one on my door at work telling people where I am.. I heard about this on NPR a while back..