Unprotected network shares

Anyone know of a tool to scan a windows network for unprotected shares? I have a big problem with users accepting defaults when sharing, and BugBear is showing up every day. We also STILL have funlove lurking about, and these unprotected shares are the culprit.

Eeye and other have tools to check for worm vulnerablity. Does anyone know of a tool to look for network shares that have no security?

Thanx….

DE