I also had a very similar problem after todays upgrade.

Wireless in Hardy worked until today.

From /var/log/syslog:

Mar 21 22:33:00 fanon dhcdbd: message_handler: message handler not found under /
com/redhat/dhcp/wlan0 for sub-path wlan0.dbus.get.reason
Mar 21 22:33:00 fanon NetworkManager: <debug> [1206135180.926190] nm_device_802_
11_wireless_get_activation_ap(): Forcing AP 'dlink' 
Mar 21 22:33:00 fanon NetworkManager: <info>  User Switch: /org/freedesktop/Netw
orkManager/Devices/wlan0 / dlink 
Mar 21 22:33:00 fanon NetworkManager: <info>  Deactivating device wlan0. 
Mar 21 22:33:00 fanon NetworkManager: <WARN>  nm_device_802_11_wireless_set_essi
d(): error setting ESSID to '' for device wlan0: Invalid argument 
Mar 21 22:33:02 fanon NetworkManager: <info>  Device wlan0 activation scheduled... 
Mar 21 22:33:02 fanon NetworkManager: <info>  Activation (wlan0) started... 
Mar 21 22:33:02 fanon NetworkManager: <info>  Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled... 
Mar 21 22:33:02 fanon NetworkManager: <info>  Activation (wlan0) Stage 1 of 5 (Device Prepare) started... 
Mar 21 22:33:02 fanon NetworkManager: <info>  Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled... 
Mar 21 22:33:02 fanon NetworkManager: <info>  Activation (wlan0) Stage 1 of 5 (Device Prepare) complete. 
Mar 21 22:33:02 fanon NetworkManager: <info>  Activation (wlan0) Stage 2 of 5 (Device Configure) starting... 
Mar 21 22:33:02 fanon NetworkManager: <info>  Activation (wlan0/wireless): access point 'dlink' is unencrypted, no key needed. 
Mar 21 22:33:03 fanon NetworkManager: <WARN>  nm_signal_handler(): Caught signal 11.  Generating backtrace... 
Mar 21 22:33:04 fanon NetworkManager: ******************* START **********************************
Mar 21 22:33:04 fanon NetworkManager: (no debugging symbols found)
Mar 21 22:33:04 fanon NetworkManager: Using host libthread_db library "/lib/libthread_db.so.1".
Mar 21 22:33:04 fanon NetworkManager: (no debugging symbols found)
Mar 21 22:33:04 fanon last message repeated 10 times
Mar 21 22:33:04 fanon NetworkManager: [Thread debugging using libthread_db enabled]
Mar 21 22:33:04 fanon NetworkManager: [New Thread 0x7f5d0ff24780 (LWP 5362)]
Mar 21 22:33:04 fanon NetworkManager: [New Thread 0x412bf950 (LWP 5788)]
Mar 21 22:33:04 fanon NetworkManager: [New Thread 0x41b54950 (LWP 5717)]
Mar 21 22:33:04 fanon NetworkManager: (no debugging symbols found)
Mar 21 22:33:04 fanon last message repeated 9 times
Mar 21 22:33:04 fanon NetworkManager: 0x00007f5d0e294cc6 in poll () from /lib/libc.so.6
Mar 21 22:33:04 fanon NetworkManager: ******************* END **********************************
Mar 21 22:34:32 fanon NetworkManager: <info>  /etc/network/interface changed: re
building the device list. 
Mar 21 22:34:32 fanon NetworkManager: <info>  Removing wireless (802.11) device 'wlan0'. 
Mar 21 22:34:32 fanon NetworkManager: <info>  Deactivating device wlan0. 
Mar 21 22:34:32 fanon NetworkManager: <info>  Activation (wlan0): cancelling... 
Mar 21 22:34:32 fanon NetworkManager: <info>  Activation (wlan0) cancellation handler scheduled... 
Mar 21 22:34:32 fanon NetworkManager: <info>  Activation (wlan0): waiting for device to cancel activation. 
Mar 21 22:34:32 fanon dhclient: Internet Systems Consortium DHCP Client V3.0.6
Mar 21 22:34:32 fanon dhclient: Copyright 2004-2007 Internet Systems Consortium.
Mar 21 22:34:32 fanon dhclient: All rights reserved.
Mar 21 22:34:32 fanon dhclient: For info, please visit http://www.isc.org/sw/dhcp/
Mar 21 22:34:32 fanon dhclient: 
Mar 21 22:34:32 fanon kernel: [  166.835687] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
Mar 21 22:34:33 fanon NetworkManager: <info>  Activation (wlan0): waiting for device to cancel activation. 
Mar 21 22:34:33 fanon kernel: [  167.437896] NET: Registered protocol family 17
Mar 21 22:34:33 fanon dhclient: Listening on LPF/wlan0/00:1a:73:bf:f0:ae
Mar 21 22:34:33 fanon dhclient: Sending on   LPF/wlan0/00:1a:73:bf:f0:ae
Mar 21 22:34:34 fanon NetworkManager: <info>  Activation (wlan0): waiting for device to cancel activation. 
Mar 21 22:34:34 fanon avahi-daemon[5438]: Registering new address record for fe80::21a:73ff:febf:f0ae on wlan0.*.
Mar 21 22:34:35 fanon dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6
Mar 21 22:34:35 fanon NetworkManager: <info>  Activation (wlan0): waiting for device to cancel activation. 

From lspci -v:

03:00.0 Network controller: Broadcom Corporation BCM4328 802.11a/b/g/n (rev 03)
        Subsystem: Hewlett-Packard Company Unknown device 1367
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at b0200000 (64-bit, non-prefetchable) [size=16K]
        Memory at b6000000 (64-bit, prefetchable) [size=1M]
        Capabilities: <access denied>

From ndiswrapper -l:
bcmwl5 : driver installed
	device (14E4:4328) present (alternate driver: ssb)