WestlawNext and the ABA Journal bring us some useful tips on maintaining attorney-client privilege, work product protections, and law firm intellectual property:
Best Practices for Sharing Legal Research
The tips are sound whether you use Google Docs, Dropbox, or some other cloud computing (i.e., internet-based) file sharing program. This story explains a bit more about the ethical issues that could arise when attorneys use the cloud.
For the OSBA take on things, pick up this CLE handout on the subject: