It's funny that despite the supersaturation of ICM info out there (SNGPlanet and the Plan3t Gong blog being two good sources [Thanks Mark]) many players still are unfamiliar with the concepts. Once at the bubble of a $5 SNG I was down to about 5-6 big blinds and pushed with 67s from the button and was called by AKo in the big blind. I hit the spade flush and I got called everything but the son of god in the chat box. Not just from the player that I doubled-up through, either. I briefly defended myself but then remembered that the table is no place to give lessons. I placed second in the tourney (1st was the guy I won that pot from) and after the last hand I typed "good game," to which he replied "f*ck off donkey." -- Nice sportsmanship!

I think ICM strategies will improve anyone's game. My guess is that it becomes more important when you are multi-tabling more than 3 or 4 tables and have less opportunity to read the patterns of the others at your tables.