Install x11vnc on the N900 and a VNC client on your PC then run x11vnc on the phone and connect to the phone using then IP address it has on your wireless network with the VNC client.

Once you have done this you can open a website on the phone's browser and then using the PC you can copy and paste the URL and it will appear in the PCs clipboard

EDIT: I use TightVNC, I don't know if any other VNC clients copy the clipboard