The other day I pulled apart my old dlink router and noticed a mini pci card inside. I was wondering if it was possible to conect it to the arduino?
Sorry if it is a stupid question but im only a newbie. So if it is impossible please let me know 
it's not a stupid question - - but it depends on - - what kind of board you have found.
search for specs publish them and see what happens 
I will publish them tomorrow.
According to a website about the router (Dlink DI-614) it is a Wireless TI ACX100 mini-pci and here are some other details:
Prodect Name: Wireless 22Mbps Mini PCI Card
Model Name: GL2422MP-MT FCC ID: KA2ACX100
But I don't reckon the arduino can support the data rates of mini pci.
Maybe when you start connecting you can slow it down to 1-2mbps?