I wash my hair every two days, and sometimes I just use whatever my mum has (normally Herbal Essence) but if I go 1-2 weeks without anti-dandruff I get really flakey. Ew.
I am not loyal to any particular brand or type of shampoo. Whatever is on sale and sudses up nicely does it for me. Conditioner, on the other hand, has to be fairly decent stuff. I use Pantene (lots of folks here use Pantene!) and the type is, ironically, Smooth. Best stuff around for my crazy-long hair that scrunches up into a knot if you breathe on it too hard!