John Henrikson over at AZCentral.com outlines the way to pour a perfect black & tan:

WHAT YOU’LL NEED
A pint glass

A spoon. A flat, wide tablespoon will work, but for better results use an official Black and Tan spoon, available online from several sources.

For the black: One can of cold Guinness Draught. (No substitutes. It must be the can, which employs nitrogen gas for carbonation.)

For the tan: One bottle of your favorite pale ale or lager, such as Bass, Harp or Mirror Pond.

POUR THE BASE
Tilt glass slightly and fill about half full of the pale ale. You’re aiming for a decent head.

POUR THE STOUT
Place the spoon over the mouth of the glass. Open the Guinness, and decant slowly, steadily over the top of the spoon. Top off the pint with a half-inch head.

While Bass Ale is the “tan” I’m most familiar with, Henrikson shares:

I got more dramatic color contrast from the lighter-hued Harp’s lager (also a Guinness product). Another time-tested favorite is Smithwick’s, the classic Irish pale ale. Also try Kell’s Irish Lager from Oregon’s Rogue Brewing. Depending on your taste, you could employ a highly hopped India pale ale like Bridgeport IPA, a West Coast pale ale like Sierra Nevada’s or just a plain old American lager like Sam Adams.

Source: Pour Yourself a Black & Tan

* 12 oz Guinness stout
* 1/2 cup sweetened Condensed milk (regular or skim)
* 1/16 tsp (or less) Cinnamon
* 1/16 tsp (or less) Nutmeg
* unsweetened Cocoa powder

How to Mix it

Gently pour a well-chilled Guinness into a small mixing bowl or glass that will hold all of the liquid ingredients. Add the sweetened condensed milk, spices, and cocoa (if it’s wanted). Stir or whisk well, and pour the mixture into a pint-sized beer mug or pub glass. Makes 1 drink.

Source: Daily Drink Recipe

* 1/2 pint Guinness stout
* 1/2 pint Lemonade

How to Mix it

Mix lemonade with Guinness in a pint glass.

Source: Daily Drink Recipes

From The Daily Drink Recipe:

* 3 scoops Vanilla ice-cream
* 1 bottle Guinness stout

How to Mix it

Put the ice cream in first, then add the Guinness carefully. Wait for the head to go down then fill to top. Blend if you want a milkshake.