http://www.thinkwiki.org/wiki/Ericsson_F3507g_Mobile_Broadband_Module
Useful info on powering off the 3g modem on a Lenovo X301. Also includes tips on powering off other power saving devices at boot / resume.
http://umtsmon.sourceforge.net/
UMTSmon is a tool to control and monitor a wireless mobile network card (GPRS, EDGE, WCDMA, UMTS, HSDPA) in a laptop running Linux.
http://www.draisberghof.de/usb_modeswitch/
USB_ModeSwitch is a little script to help switch multi-mode USB devices between modes. Mostly it's for 3g wireless modems which load initially as a usb drive with the Windows drivers. Compatible with the Huawe E220 and E169.
http://dalelane.co.uk/blog/?p=254
Article on how to get the Huawei E169 running on the EEE PC (a Linux distro). Includes very detailed instructions including links to USB_ModeSwitch.