I don't want to suggest that there is any inherent connection between being Irish and drinking a lot. But hey, who doesn't enjoy a wee nip now and then, especially on holidays? So... here are a list of particularly apt things you might enjoy on St. Patrick's Day. (I used to have more links here, but some of them stopped working, or else the companies stopped making certain products I had listed.)

Beer
Conway's Irish Ale (Great Lakes Brewing)
Guinness

Coffee creamers
Baileys
Coffee-Mate (I swear they used to have Irish cream flavor, but they don't seem to anymore)
International Delight

Foods
Irish Coffee Cupcake recipe
McCann's Irish Oatmeal

Irish Cream
Baileys
Carolans
Quintessential Brands (Brogans, et al.)
Ryans (Sazerac Company)
Saint Brendan's

Other
McDonald's Shamrock Shake