I haven't seen too much yet on this topic. Any advice or recommendations for locating domain reseller companies?

Enom has a pretty popular domain reseller program - See http://www.enom.com/resellers/ for more information.

Directi.com is also pretty good...

eNom is by far the largest although you have to put money down to get started with them (minimum of $200).

Roj

Registerfly.com or Opensrs ?