Transform Texture Coordinates is a handy op that goes under your material and allows you to modify how your texture is mapped onto your object.

You can use this to quickly setup repeating textures by adjusting the repeat settings and scale your texture maps to a more believable realworld scale- for example highres brickwork textures on a wall. You can also get creative scrolling effects or come up with special effects that use one texture to drastically change how your 3d model is textured.