The 10.0 online help recommends this in extreme passive voice:
When creating tools that will be shared later, it is best to store a copy of all your base materials (toolboxes and Python files) locally for safekeeping without any password protection.
This means if you have a toolbox with half a dozen script every time you do an update you need to right click on each script tool to import the updates.
It would be really nice to right click on a toolbox and be able to "import all scripts".