Well, the situation is now better, with two phones from Verizon that have 3G hotspot capability as a part of the cell phone. I bought a Palm Pre Plus, and can turn on a hotspot at any time, for use by multiple computers or devices. It works great, and now I don't have to carry the phone and a WiFi box, and worry about multiple different batteries to keep charged. The same level of access is also less expensive with the phone hotspot.
With the Palm Pre, I have Web access for the netbook or the iPad wherever I get cell service. I have no problem accessing Zipforms Online and doing contract documents. In fact, there's an app with the iPad that makes it easier yet. Now I can do purchase agreements, counter offers, and other documents in my customer's home, hotel room or other location.
That's all great, but it isn't good enough unless I can easily print out the document to get their signatures. Sure, some love their tablet computers for signatures, but I found it a pain to try and show my client the contract clauses on the screen for explanation, then keep turning the computer around for their signatures. They prefer the paper, and the last piece of our mobile real estate office, printing, is next.