Again, not exactly Alfredo, but Hollywood & Vine had a seafood pasta on their lunch buffet that was amazing. Lots of kinds of shellfish and a really good cream sauce.
Also, if I may, quick and easy alfredo recipe (sure, it's got about 4 jillion grams of fat, but it's worth it as an occasional treat):
1 stick butter
1 c. heavy cream
1 egg yolk
1/2-1c. freshly grated parmesan cheese.
Melt the butter, stir in the cream and heat over low-medium until warm. Whip egg yolk a little, then add a Tbs. or so of the warm cream mixture to it. Keep adding cream mixture, 1 T at a time, until the egg yolk is a little warmer than room temp, then mix the egg with the rest of the cream mixture. Cook for a few minutes, stir in the parm, and serve over fettucine.