Ritchey Innovader 2.0 - 26x2 (no longer on the Ritchey website, maybe discontinued? The new ones are 2.1 inches instead, and slightly different looking. Should basically be the same tire)
Good all-around tire. Not recommended for anything specialized, but if you're using your bike for both street and trail in one day, this works well.
Schwalbe Ice Spiker - 26x2.1
Excellent winter tire. Very good grip, very durable.