Can I plug two external monitors in to a MacBook Pro?
In order to attach two or three monitors, you could use a third party device like Matrox GXM (Graphics eXpansion Modules) - you can connect two or three monitors from your Display Port, however, there are some limitations (like the OS does not know natively that there are two or three monitors connected and treats it like one). The price is about $350 for the Tripplehead and around $220 for the Dualhead one.

Here is the GXM homepage.