If you have the data service from your cell provider and have a Windows Mobile based phone there are hacks you can do to essentially turn your phone into a USB modem and use it on your laptop at no additional cost. Basically, the ability comes disabled, and a registry change or two, and running the program already located on your phone will give you internet access.
My Verizon XV6700 worked great (switched providers, ended up with iPhone, won't start with the complaints.) I get speeds faster than some of my friends home DSL in many areas.
Google it, and it may save you an extra $15+ a month.
Also, if your aircard has an external antenna connector, I would suggest getting an external antenna. I paid $15 for mine off of eBay.