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I am the same way, when I need to record a video and encode them I use my iMac, but my main machine around the house has definitely shifted over to the iPad.
 
I have to agree with some of the others. There is no way I could replace my Mac Pro with an iPad. Unless I stopped doing anything but browsing the web on my desktop.

My Air on the other hand, I have only used it for testing. I am hesitant to get rid of it, but I think I will and get an old Macbook for testing.
 
I put some serious time in on my iMac (doing iPhone app development), but for just about everything else, I've been using the iPad.

I'm just amazed at how useful this thing is.
 
Shipping out my Air to a lucky eBay bidder this afternoon. I will more than likely pick up a Mini or smaller iMac to handle sync'ing and media duties.
 
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