My kegerator will hold seven kegs - actually, I think I could shoehorn in an eighth, I just don't have one (yet). But, since I usually have something in there fermenting or lagering, there are usually 5-6 beers on tap. And almost always 1-2 fermenting or conditioning.
Right now, on tap: Berliner Weisse, Porter, Black Lager, THA Clone, Tripel
Conditioning: Barrel-Aged Oatmeal Stout
Fermenting: Triple IPA, APA
That means I have two fermenters open, which isn't unusual since the move. Tragically, I now have fewer people coming by to help me drink.