I've got a WWAN card that required a bunch of fiddling with pppd under 5.9 to get online. I upgraded to 6.0 and my pppd dialup script stopped working. I soon discovered I had a new NIC: umb0. A man page read and an ifconfig command later, I've got a working WWAN-based connection to the internet. Piece of cake.
I really like being able to connect with a simple ifconfig command instead of all that pppd config I had before. If you're in the market for a WWAN card for your OpenBSD box and you have a BIOS that doesn't get in the way of using the hardware of your choice, you might want to consider the list of devices on the umb man page.
