about that ingame betting, i really dont know which allow US-citizens. but its really great, like yesterday, 3-1 sweden after 1H. i played under 4.5 and under 5.5, cos you know they will slow down after such a great 1H. i noticed couple of trends in the last few years, that are cashing at a very high strike rate.
the books let you really see the form of both teams, their attitude towards the game etc. things that you cant see pregame.