How I got my WIFI back after 10.5.8 update

Hi, I too lost my WIFI connection after updating to 10.5.8.
After trying a lot of things (resetting PRAM, SMC...) I managed to get my connection back doing the steps below:
1) Delete preferences in /Library/Preferences (com.apple.network.identification.plist, com.apple.airport.preferences.plist & NetworkInterfaces.plist)
2) Delete preference com.apple.networkConnect in ~/Library/Preferences
3) Restart computer
Note: after restart you will lose all of your network configurations
Important: if your router has its SSID hidden, make it visible (mine was hidden and it didn't work)
4) Look for available networks. Luckly, you'll find your router's SSID. Connect, enter password, etc.
5) After checking everything's ok, you can revert your SSID to hidden (I did and it's still working)
Repeat step 4 for every WIFI you want to connect.
Hope this helps you people!

Had issues with my WiFi router too, after upgrading my MacBook Pro 13" to 10.5.8. Not sure we're talking about the same issues, but my MacBook connected to my WiFi network, had also a IP address, but couldn't connect to any host, nor on the local network neither outside.
After reading your post I tried to remove the network completely from the list of known networks and to set it up from scratch. Seems it works now...
Thanks,
Thomas

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