The post celticcurls linked to is fabulous.

I use a shampoo with cocamidopropyl betaine (Kiss My Face everyday shampoo - sulfate free) once or twice a week and use the occasional product with amodimethicone and have no buildup.
embracing my inner curl since late Nov 2006
2b/3a (I think?)
color-treated red/brown, medium-textured hair
PJ, currently using Suave citrus smoothie, B2B pom cond, GF C&S leave-in, AG re:coil, LOOB, HE SMU, Jessicurl HCC, CC, AIS