I have a relatively critical control-panel online. If someone with malicious intent were to log in, there would be a significant risk to property. I will be hosting said site on Google App Engine, everything will be through SSL, and have a proper password system with random hashes.
Now, looking through app-engine questions on SO.SE, I found this answer that indicates that it would be best not to deal with passwords at all, and instead use Google Accounts login.
What are the pros and cons of using Google accounts v. managing my own password database?