Now, if you want to play with WiFi, fine. If you can kick loose $60 a month and startup hardware costs in the $200 range, you can get an "EVDO card", which is PCMCIA from a company like Verizon. It's basically a complete cellphone on a card that gives you a DSL-grade connection in urban areas, dial-up speed anywhere a Verizon cellphone signal works. $60/mo "unlimited" - unlimited airtime, but the rules of use rule out massive file transfers on a regular basis (they don't yet have enough shared bandwidth) and if you violate the "terms of use" too often they'll cancel you (ug!).
Not quite. If you're in an area supported by the EVDO network, you'll get upwards of xDSL speed (UP TO 2Mbps). However, those areas are still pretty limited. If you can't get EVDO, you'll fall back to 1xRTT (the older network) and get something between dialup and ISDN speeds. It's advertised as 144kbps, but it's less than that in most cases. If you're not on either network, you'll get standard dialup via the cellular network, which gives you something like 19.2kbps throughput.
I haven't heard anything about getting disconnected for excessive use. I've been using it since the old 1xRTT system went public 4 years ago. I and many of my coworkers use it for business purposes. I've had my bandwidth counter show total transfers in the hundreds of megs for a session.
All that said, I've had usable bandwidth from the DC area on down to almost North Carolina via I-95. I've also had connectivity most of the way down I66 from NoVa to I81 and most of I81 from Front Royal to Roanoke. I was able to get connected in Gatlinburg, Tn with the old 1xRTT card, but the newer EVDO card with it's crappy antenna couldn't quite do it.
If you're in an area with lots of WiFi access points, I'd stick with that. It's faster and cheaper (assuming free access). The Verizon system works well, but it's like having another cellphone with all of it's related contracts, etc. With broandband, WiFi, etc becoming more common, I rarely pull out the Aircard anymore. In fact, the times when I do need it due to lack of WiFI, I'm out of area or I'm riding in a car going on a trip.
I agree completly on the antenna aspect.
Disclosure time: I WORK FOR VERIZON, BUT NOT THE WIRELESS GROUP. MY VZW PRODUCTS AND ACCOUNTS ARE IDENTICAL TO WHAT CONSUMERS GET.
Chris