What return before moving on?

[alwaysworking]

I have a plan for marketing and promoting my websites. I will be using article marketing, Squidoo, HubPages, social bookmarking, forum marketing and probably other things as I go. My intention is to focus on two to three areas at a time until I see some results and then adding in more forms of promotion one at a time. If you were to follow a similar plan, at what point do you think a traffic source is giving a good result before moving on to something else?