I have a Dell-made, Broadcom-based wireless card, BCM4322. I'm using Broadcom's proprietary drivers from RPM Fusion.
lspci | grep -i broadcom
09:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5784M Gigabit Ethernet PCIe (rev 10)
0c:00.0 Network controller: Broadcom Corporation BCM4322 802.11a/b/g/n Wireless LAN Controller (rev 01)
Since installing F11, I can no longer connect to WEP-secured wireless. When I use automatic IP settings, the connection simply times out. When I specify an IP, Netmask, Gateway, and DNS server, NetworkManager thinks the connection properly established, but any pings time out, even when I don't specify a hostname (just an IP address). I can connect to (and use) unencrypted wireless. I haven't tried other encryption schemes. The WEP index is 1 and it's non-authenticated (open). I've been playing with the settings for over a week now with no success.