Thanks Tom. Couldn't agree more about Networking, I dread it whenever I get a new machine.
My network is only 3 strong at the mo - main workstation on Win7, old one on XP64 and then my laptop (used for emails, admin) on XP32bit. I'm going to upgrade to a new router next week with a built in 4 port Gigabit swith, so that will help to some extent, but I never had any speed issues with the 100mb setup until adding the Win7 box. Think I might also try adding a separate network card into the Win7 box instead of using the built in adapter, which may help.
On a separate note, have you had any problems with Backburner on the Win7 machine? I'm having a nightmare with the BB Manager becoming unresponsive and losing connection with the BB Servers, both on across the network and on the machine also running BB Manager. Weird thing is, it's intermittent - sometimes it works, but lastnight when I left it rendering 6 images, it locked up after 2 images and left me right in the sh#t. Again, it used to work fine on the XP64 machine.