Reload Families, en masse.

If you need to re-load a large number of families, right clicking the family name in the project browser, and hitting "Reload" may become a long and tedious process.
Instead, you can select all families files, in Windows Explorer, and Drag&Drop them into a Revit window. Revit (I tried with 2009) will ask you if you want to load the families, or open the files in separate windows. Chose Load, and Revit will reload every file you dragged&dropped, also asking, time by time, if you want to make the family editable, and if you want to override the parameters value.