A delicious drink which is a bit of a wildcard - the taste and appearance of cream soda varies widely from brand to brand. What they all have in common, however, are the properties of being incredibly sweet, slightly vanilla-tasting, and very foamy.
Many generic brands of cream soda - like the kind with supermarket names like hy-vee cream soda - are clear. barq's famous red cream soda, is, as its name implies, red. A&W cream soda is yellow - I like that because you can put it in a glass and, because of appearance, people think you are drinking beer, and stop asking you if you want beer.
cream soda is, unfortunately, not widely available - I have yet to see a fountain carry cream soda, and supermarkets stock very little, and run out frequently.