Hi guys, just registered to share my experience.
I have Firmware Version : 4.00 ,  Wed 22 Oct 2008 , i had a lot of wireless problems with it , when i turned on my Dell never been able to access the internet ,  but i was able to log in to the router (192.168.0.1) , sometimes the connection was  dropping off, not disconnected , just not able to use the network . Always needing to restart it . 
 My problem was fixed when i updated my network card Intel(R) PRO/Wireless 3945ABG to the latest driver .
Maybe this post will help some unsatisfied D-link owners.  

    Sorry guys it was working for some hours , but now its happening the same thing  

 . to bad , dlink supposed to be good quality