I haven't worked with shift registers before but have looked through the tutorials and get the gist of it. I have a couple of questions though-
I'm planning on using the TPIC6B595: http://www.sparkfun.com/commerce/product_info.php?products_id=734
is there a practical limit on how many shift registers can be daisy-chained together? 3? 4? 50? ;-)
if I want the shift register to source higher voltage/current than the arduino can handle, is it just a matter of powering the register with my 2nd v source (but having common ground with the arduino source)?