First off, thanks for the feedback. The article on the website had been updated slightly to explain the final aircrack command. Props to br0adband on IRC for the tip.
In regard to the WG511T injection problems I don't have any easy answers. Patching drivers and updating kernels (especially the BackTrack kernel) are completely different tutorials (
slackbook.org has a good guide to compiling a kernel from source). Currently I'm trying to get the patched drivers to work with an updated slackware install, I'll try to keep you posted.
I've just moved, though, and I'm starting work again so progress might be slow.