When it comes to laptops, with a very few exceptions you cannot upgrade the CPU or GPU.
In the future we may have a few USB3, Thunderbolt or external PCI-express upgrades but that won't help you now.
IIRC there are a few external USB2 graphics solutions but they would be hard to find now and at least as slow as what you have. I can't say I have ever seen a Firewire option, but then again I'm not into fruit computers. Express Card 54 may actually be an option, just don't expect it to be cheap or easy. There are several e-gpu DIY projects on the net, but for me at least it would be better to save up and get a new laptop with a real discreet GPU (read non-intel). This items comes to mind, but I have zero experience with it. http://www.villageinstruments.com/tiki-index.php?page=ViDock
Sorry for the bad news.