Help - problems connecting to our office wifi

Hi, I've got a 2g touch running the latest 3.1 fw.

We have recently changed our office wifi router to a new D-link router and I'm now unable to connect to WiFi. With the old Belkin, there were no problems, which generates the question - if it ain't broke, don't fix it.

Now everyone else in the office (about 15 iphones and 2 touch) can connect apart from my touch and one other iphone. I've no other problems with any other wireless networks.

1. I've 'forgotten the network' and reset the router - nothing.
2. I've run a factory reset on my touch - nothing.
3. I've manually set up the network and still nothing

Any suggestions on where to look next would be appreciated.

Cheers

Corskey