Google 2-Level Login

Has anyone looked into Google's 2-level login utility?

http://www.google.com/support/accounts/bin/static.py?page=guide.cs&guide...

Uses a phone -- any kind of phone: land line, cell, Android... -- to send a second code for accessing one of their services. The code can last up to 30 days. Whats especially nice is not needing to incur text message charges if so desired.

I'll be experimenting and checking in with our institutional security and FIPP folks too.

Looks like an interesting alternative for our more secure systems.