There are probably none at the moment, except through Dell - from click here:
"Where are the notebook or laptop drivers?
...NVIDIA is NOT allowed to directly distribute drivers for the vast majority of Notebook and Laptop computers.
The only way to get updates for NVIDIA laptop or notebook graphics cards is though the notebook provider."
Latest 7950GTX drivers from Dell: click here (dated 2/21/2007), which you've probably got already. G