3G iPads come without contracts. I would never consider buying one of those subsidized netbooks that come with an expensive contract. So if you were choosing between a netbook with a contract and a 3G iPad, the iPad would make a lot more sense.
I have a reservation for a 16 gig wifi iPad but I may decide to let it go and wait for a 3G version. I don't mind calling up At&t and activating it for a month if I'm about to go on a trip where I'd need it. I'd simply let it run out and activate again the next time I needed it. I bet I could get away for $15 to 30 a year and have 3G internet with me when I go on vacations. Even with free wifi at hotels, I'm stuck waiting till I get to my room to do anything with it. I could use the 3G at a rest stop on the highway if I wanted to.
I remember one time my daughter was late turning in a paper and she didn't tell us until we were on the road to go pick up her brother on the other side of the state. I grabbed my netbook and we piled in the car. Once she had the paper typed, we had to get off the highway and look for a coffee shop with free wifi so she could turn in her paper. I would have gladly paid a one time $15 to get it turned on so she could upload her paper without getting off the highway and burning up gas looking for free wifi. But I would never consider $40-60 a month worthwhile just in case we ever needed 3G on the road again.
It's all a personal decision, but I'm still not convinced a 3G iPad is worth it for me. I have an iPhone and an Android phone. So in your situation, I could have looked up the coffee shop with wifi on the phone. I'm already paying a monthly cell phone fee so no need to add another monthly fee to my bill. If I need to look something up where there's no wifi, I'll use my phone. It's always with me anyway.