DT wifi'd at the moment but I have now bought the USB 'A' to RJ45 dongle and am about to try linking the DT with that.
'Fluctuations' are definite on the DT but I have not looked to see if the Laptop has the same problem.
I 'got' a 54Mbps 11g PC card with the router bundle and I will try that in the LT.
Hey Ho!
Update: The PCMCIA card made little difference to the LT performance BUT the RJ45 to USB adaptor has dramatically improved the DT's internet speed.
Only cost a few squids too 
. It really flies. It has solved the problem of dropping the wifi network too. I recommend this solution for those who do not want to fit an Ethernet card.