Hello David,
In brief, I've solved this problem on my Dell Inspiron 1525 (with Broadcom 4312 wireless card), so I figured letting You know would be nice, 'cause it didn't seem like the issue is resolved.
Visit this link: http://jomcode.com/fadhil/?p=59
and in addition check out the comment on the same page by Andre Kiepe to have the modules load on boot.
Best Regards, Milos.