Sit with the team
ByTeams are core to agile practices and a ScrumMaster plays a critical role in optimizing team execution. One of the common impediments that interfers with this is the team work area or lack thereof. Without a common workarea it is very difficult to really understand what is going on with a team. The daily standups are a very inadequate way of tracking team progress. So much more is learned when you hear the intra-team discussions. It is these informal times expose what is really going one with a team.
We as ScrumMaster need to keep in continuous touch with the team. It is imperative that we sit with our teams as much as possible. This is the only effective way you can be an effective gate keeper.