I have a path and I was wondering if it were possible to erase on along this path. Anyone ever heard of such a thing?
There's quite possibly an easier way but one way that springs to mind is:
This method has the advantage that you can selctively edit the layer mask in case you do not want to erase along the entire path.
Note: If you want to erase the background using this method, you'll need to promote it to a layer first (Layer -> New -> Layer from background)
You can indeed erase along a path. To do so (instructions for CS4):
If the result isn't quite what you expect, undo the last action, select the Eraser tool from the toolbar (or hit default hotkey e) and change the brush style and size accordingly, repeat steps 4-6.