Seems like with each update to Ubuntu, wireless seems to get better. This is just a quick note for anyone using Ubuntu 8.10 (Intrepid Ibex) on a Dell XPS 1330 with a recent Dell Wireless. I've been having problems with the wireless dropping in and out (every 100 packets or so the wireless connection would reset, what a pain). To solve it (and don't ask me how this specifically works), I upgraded to the proposed new kernel (.10) and the key was to remove the entry from the network manager and create a new connection including wiping out my past WPA password.

Works peachy now! Hope this helps someone out.