I just read a report that states when we request stumbles, diggs, etc by our friends, they have less weight than an organic stumble. So I have to ask is it beneficial to any of us to do reciprocal stumbles?
The report I read says the way to get to the top of the Digg or Stumble pile is to utilize the top stumblers, befriend them, vote for a couple of weeks on some of the things they Stumble, then after a few weeks of non-submitting items then you may be able to get some love.