Graphics cards.....How can I tell if I can hook more than 1 monitor up to them? I really feel dumb that I can't figure this out.

ex.) I'm looking at getting:

EVGA 01G-P3-N895-A3 GeForce 9800 GX2 KO 1GB 512-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card