I haven't closed the session, or resumed the system. I can see the wireless connections available listed twice (see attachment). Restarting hal does not fix the problem (see bellow).

gringo@lethe:~$ uptime 
 12:26:29 up 1 day, 18:49,  7 users,  load average: 0.33, 0.55, 0.53


gringo@lethe:~$ nm-tool 

NetworkManager Tool

State: connected

- Device: eth0 ----------------------------------------------------------------
  Type:              Wired
  Driver:            tg3
  State:             unmanaged
  Default:           no
  HW Address:        00:00:00:00:00:00

  Capabilities:
    Supported:       yes
    Carrier Detect:  yes
    Speed:           100 Mb/s

  Wired Settings


- Device: wlan0 ----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            iwl3945
  State:             disconnected
  Default:           no
  HW Address:        00:19:D2:3D:59:8B

  Capabilities:
    Supported:       yes

  Wireless Settings
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points
    ltknet:          Infra, 00:1E:8C:2E:6A:26, Freq 2437 MHz, Rate 54 Mb/s, Strength 46 WPA2
    bici:            Infra, 00:1F:C6:61:92:8F, Freq 2432 MHz, Rate 54 Mb/s, Strength 54 WPA2
    AlexR:           Infra, 00:18:F8:4A:D2:BB, Freq 2462 MHz, Rate 54 Mb/s, Strength 45
    diana:           Ad-Hoc, 02:1C:BF:01:DF:83, Freq 2462 MHz, Rate 54 Mb/s, Strength 43 WPA2
    Spike:           Infra, 00:1E:E5:5B:AD:99, Freq 2422 MHz, Rate 54 Mb/s, Strength 38 WPA
    Wireless Network:Ad-Hoc, 76:C2:50:21:8D:EF, Freq 2462 MHz, Rate 11 Mb/s, Strength 35
    mariusssss:      Infra, 00:21:91:71:1C:C6, Freq 2437 MHz, Rate 54 Mb/s, Strength 38 WPA
    Free Public WiFi:Ad-Hoc, 7A:9E:5C:19:A2:E7, Freq 2462 MHz, Rate 11 Mb/s, Strength 35


- Device: wlan0 ----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            iwl3945
  State:             disconnected
  Default:           no
  HW Address:        00:19:D2:3D:59:8B

  Capabilities:
    Supported:       yes

  Wireless Settings
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points
    ltknet:          Infra, 00:1E:8C:2E:6A:26, Freq 2437 MHz, Rate 54 Mb/s, Strength 46 WPA2
    bici:            Infra, 00:1F:C6:61:92:8F, Freq 2432 MHz, Rate 54 Mb/s, Strength 54 WPA2
    AlexR:           Infra, 00:18:F8:4A:D2:BB, Freq 2462 MHz, Rate 54 Mb/s, Strength 45
    diana:           Ad-Hoc, 02:1C:BF:01:DF:83, Freq 2462 MHz, Rate 54 Mb/s, Strength 43 WPA2
    Spike:           Infra, 00:1E:E5:5B:AD:99, Freq 2422 MHz, Rate 54 Mb/s, Strength 38 WPA
    Wireless Network:Ad-Hoc, 76:C2:50:21:8D:EF, Freq 2462 MHz, Rate 11 Mb/s, Strength 35
    mariusssss:      Infra, 00:21:91:71:1C:C6, Freq 2437 MHz, Rate 54 Mb/s, Strength 38 WPA
    Free Public WiFi:Ad-Hoc, 7A:9E:5C:19:A2:E7, Freq 2462 MHz, Rate 11 Mb/s, Strength 35


gringo@lethe:~$ hal-find-by-capability --capability net.80203
/org/freedesktop/Hal/devices/net_00_19_b9_51_3d_64
gringo@lethe:~$ hal-find-by-capability --capability net.80211
/org/freedesktop/Hal/devices/net_00_19_d2_3d_59_8b

gringo@lethe:~$ sudo /etc/init.d/hal restart
[sudo] password for gringo: 
 * Restarting Hardware abstraction layer hald                                                                                        [ OK ] 
gringo@lethe:~$ nm-tool 

NetworkManager Tool

State: connected

- Device: eth0 ----------------------------------------------------------------
  Type:              Wired
  Driver:            tg3
  State:             unmanaged
  Default:           no
  HW Address:        00:00:00:00:00:00

  Capabilities:
    Supported:       yes
    Carrier Detect:  yes
    Speed:           100 Mb/s

  Wired Settings


- Device: wlan0 ----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            iwl3945
  State:             disconnected
  Default:           no
  HW Address:        00:19:D2:3D:59:8B

  Capabilities:
    Supported:       yes

  Wireless Settings
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points
    ltknet:          Infra, 00:1E:8C:2E:6A:26, Freq 2437 MHz, Rate 54 Mb/s, Strength 35 WPA2
    bici:            Infra, 00:1F:C6:61:92:8F, Freq 2432 MHz, Rate 54 Mb/s, Strength 40 WPA2
    AlexR:           Infra, 00:18:F8:4A:D2:BB, Freq 2462 MHz, Rate 54 Mb/s, Strength 45
    diana:           Ad-Hoc, 02:1C:BF:01:DF:83, Freq 2462 MHz, Rate 54 Mb/s, Strength 33 WPA2
    Spike:           Infra, 00:1E:E5:5B:AD:99, Freq 2422 MHz, Rate 54 Mb/s, Strength 45 WPA


- Device: wlan0 ----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            iwl3945
  State:             disconnected
  Default:           no
  HW Address:        00:19:D2:3D:59:8B

  Capabilities:
    Supported:       yes

  Wireless Settings
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points
    ltknet:          Infra, 00:1E:8C:2E:6A:26, Freq 2437 MHz, Rate 54 Mb/s, Strength 35 WPA2
    bici:            Infra, 00:1F:C6:61:92:8F, Freq 2432 MHz, Rate 54 Mb/s, Strength 40 WPA2
    AlexR:           Infra, 00:18:F8:4A:D2:BB, Freq 2462 MHz, Rate 54 Mb/s, Strength 45
    diana:           Ad-Hoc, 02:1C:BF:01:DF:83, Freq 2462 MHz, Rate 54 Mb/s, Strength 33 WPA2
    Spike:           Infra, 00:1E:E5:5B:AD:99, Freq 2422 MHz, Rate 54 Mb/s, Strength 45 WPA

gringo@lethe:~$ hal-find-by-capability --capability net.80203
/org/freedesktop/Hal/devices/net_00_19_b9_51_3d_64
gringo@lethe:~$ hal-find-by-capability --capability net.80211
/org/freedesktop/Hal/devices/net_00_19_d2_3d_59_8b