What different bricks exist with studs on the sides?
There are a lot of elements shown (together with other possibilities and SNOT-techniques) at holgermatthes.de, where there are pieces that are really bricks with side-studs (excluding all the other possibilities for SNOT-building) are those (+ the headlight/erling-brick and the big gray blocks you can see here, which are not shown in the following image):