I tested the new AT&T Sierra AC881 PCMCIA card with the TopGlobal MB8000 and it works great after putting *99# in the phone number field under the wireless internet category. Here are some pictures them together:

Here you can see that all the appropriate lights are green and the light on the card is blue. I let this run for about an hour to see how stable it was and it held strong it didn't loose a signal at all.

Here you can see that all the appropriate lights are green and the light on the card is blue. I let this run for about an hour to see how stable it was and it held strong it didn't loose a signal at all.