I got an email today from David Cohen asking me about high speed wireless options for his laptop.  Since I answered him in email I figured I should at least get a blog post out of it too.  To clarify we're talking cellular wireless here, not WiFi, etc.  As I explained to David there are three good options, at least in the Boulder/Denver area.

You can choose from the three major providers (T-Mobile being the exception here, they don't have a 3G network just yet) - they all cost roughly the same ($60).  They are all roughly the same speed although AT&T's HDSPA network is theoretically faster than Sprint and Verizon's EVDO networks.  The issue with AT&T is coverage, while they've turned up a large portion of the country their coverage doesn't match Sprint or Verizon.

We've been using Verizon's EVDO network for about 3 years now and have never had any issues with it (other than the occasional dead area).  If you need always-on high speed access when you travel get it, you'll love it.

As for connectivity you have a few options.  Many of the newer laptops come with these wireless cards built in (generally referred to as a WWAN card for Wireless Wide Area Network) but if you've got an older machine you're not out in the cold. You can either use many of the PC Cards available (if your laptop has a slot) or a USB dongle if not (Verizon even has one that you can put a MicroSD card in for double duty).