A new option was added in SolidWorks 2011 SP3 that you may find quite useful. In a past release, the new functionality of merging drawing notes when dragging over one another was introduced. This is great when you need to combine the annotations, but can make the positioning of notes tricky when in close proximity and you don’t want them to merge.
In the latest service pack, the new option can be found under System Options > Drawings > “Disable note merging when dragging”. Enabling the option will prevent notes from merging with other notes, balloons, and dimensions.