I'm having the same problems! I haven't noticed it being any better or worse depending on the URL. I'll be able to surf about 3 sites (I don't know if it's the number or the timing) and all of a sudden the network will die - just like you the wireless connection will be great. When I disable to radio for a few seconds and re-enable it, I'll have great throughput for a while. Sometimes Fn-F2 doesn't work, however, and I have to go into ProSET to disable and enable the radio.
Are you using a range expander or repeater on your wireless network? What BIOS version do you have? Have you had any luck fixing the problem?

I600m
Intel Centrino 1.3GHz
256MB RAM
Intel Proset ver 7.1.3
A16
WXP Pro SP2
Linksys WRT54G Router - Version: v3.01.3
Linksys WRE54G Expander - Version: 1.04.17

Message Edited by mark7tenor on 01-29-2005 08:05 PM

Yes, I found that the problem of stalling had to do with it looking for the Windows 2000 domain controller that it was connected too when it was initially setup. It had nothing to do with signal strength. It would periodically look for it when certain operations were performed. I found it by searching the registry, for the DC's name and removing ALL signs of it and the problem vanished.