Comment 4 for bug 47573

After some thoughts about the issue, I've found this in the changelog of the linux-restrictd-modules-package:

---snip---

linux-restricted-modules-2.6.15 (2.6.15.10-1) dapper; urgency=low

  * Add madwifi-ng support

 -- Matthew Garrett <email address hidden> Tue, 16 May 2006 13:45:04 +0100

---snip---

Seems to me that your card has a chip which is (or may be) supported by modwifi-ng.