I still have my Verizon EVDO PCMCIA card from my work laptop that I no longer use. I paid Verizon the 180$ to cancel the "phone line" so I could get the same card again from Sprint whom I have my regular cell service with. Sprint offers EVDO speeds in more cities than Verizon so it was good for me.
But if you want to stick with Verizon you can PM me and I'll fill you in on my extra card. You can also e-mail me at email@example.com
Btw... the PCMCIA cards work far better than the internal WAN cards that you see Dell offering in the Latitudes right now. With the Verizon and Sprint PCMCIA cards I'm able to listen to Launchcast uninterrupted driving up and down I-95 and I-75 in Florida doing about 80mph. The technology is very seasoned and works quite well. Sending large e-mails with attachments while driving was not a problem either. And if EVDO isn't available the Verizon software switches you seemlessly to 1x data mode. The Sprint software will interrupt your connections while making the switch between network types. That's one area I'm disappointed in... but I've only ever had to make that transition when driving thru states like Alabama and Mississippi along the coast.