At first I thought you could only use one martial maneuver a round, but after looking through Tome of Battle, I can't seem to find that explicitly stated anywhere. Is there really such a restriction and I'm just not finding it, or can you use multiple maneuvers provided their action requirements allow it (i.e. a move action Boost in the same round as a standard action Strike)?
There are only a few requirements for using a maneuver:
As you say, this means you can use more than one per round. In fact, that is exactly how the system is intended to work: while in a Stance (you should basically always be in a Stance, unless you were ambushed while sleeping or something), you use a Boost to power yourself up, and then bash your enemy with a Strike. If you use a Counter, you give up your Boost in the following round. If you want to change Stances, that replaces your Boost and you can’t do it the same round as a Counter.