I've tended to use the Sparkfun Easy Driver (http://www.sparkfun.com/products/10267) to drive small stepper motors.
I'm working towards trying out the Trinamic TMC223 IC (http://www.trinamic.com/tmc/render.php?sess_pid=394) which use a 2-wire ( http://en.wikipedia.org/wiki/I%C2%B2C ) protocol instead of the more common step/dir pins and which also has stall/missed step detection. I've used 2-wire temperature/humidity sensors previously in dew controller's I've made for controlling telescope heater straps.
If the IC's do what they appear to be set up for they should be great for application such as focusser control and possibly very small CNC setup's (stall/missed step detection would be a big bonus for both).
The additional components required to use the TMC223 seem to be very minimal.
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