There is reselling to other investors:
dnforum.com, namepros.com, domainstate.com plus many of webmaster/IM boards have domain areas (ie. digitalpoint)
Marketplaces:
sedo, afternic
and plain ol' contacting people who might be interested via email, phone, letters, walking up to their store.
Marketplaces: sedo, afternic
and plain ol' contacting people who might be interested via email, phone, letters, walking up to their store.