So far, so good. I figured out it was iwn, not iwm :). Grabbed it, unpacked it, made it available to the kernel on boot and rebooted. Sure enough, the driver loaded! It kinda hammers the wifi when it's not configured (the wifi led flickers a bunch) - I just switched it off (thanks Lenovo for the wifi switch). Now, I just gotta type in all the init stuff and it'll hopefully work without the constant polling. Thanks @igor for the link and thanks @adventuresin9 for the tip on hget and link. Once I get it working and configured, I'll report it back to close the loop. 
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