The greatest value I've gotten from SB . . . man, that's hard. SB brought me my mentor (NW Grateful Diver) and also started me on the road to DIR dive training (which Bob furthered) and that training is almost certainly why I still dive, and absolutely is why I cave dive.
And I have met SO many people through this board, some of whom have become extremely close and valued friends, Bob among them. Mo2vation, HBDiveGirl, KMD, rhlee, alwaingold, kidspot, dive-aholic, cool_hardware 52, OE2X, Snowbear, chickdiver . . . I can't even BEGIN to list the people who have dived with me, who have mentored me, who have been role models and supporters. The single biggest value of networking sites like this is the people.
What surprised me? How long any thread I start about DIR diving can run, and how amazingly emotional it can become!