GOIG is interesting because they have a patent pending technology that looks like it could be pretty useful. If they sign up as many companies as they are trying to, and they don't increase operational costs as much, then their revenue should be in the $10s of millions. I think their goal is something like $5 million per month.
Their launch was delayed, but they issued a PR saying April is the new target. I was in, but got out and am just watching right now. They issued a PR a while back that says three of the four major wireless carriers are on board. I'm waiting for a PR saying the fourth is confirmed. However, their service does work on all four at the moment, which is a good sign. Once I am confident that the deals are finalized, I'll get back in.
My conservative estimate is that it will be worth about $0.05 by end of 2010 if everything goes as planned.
Bet on the jockey, not the horse.