You're in the US, right?
I've read online that AT&T's 3G dongle works under the latest Ubuntu, but the mini ships with the previous version on it. It's not really a problem to install the new version (search for "Intrepid Ibex" on these forums for clear how-to's), but there's a lack of driver for the bluetooth module in the new version (again, if I'm remembering correctly).
Obsidian Mini 9 >
2gb ram, 16gb ssd, bluetooth, 1.3mp webcam, us-intl kbd Internal Mods >
usb hub, 16gb flash drive, 8gb flash drive, added webcam, changed kbd Software Mods >
Dellbuntu 8.04.1 | Gentoo 2008.0