Bullion value calculator is pretty much done
The bullion value calculator I created using Google App Engine now allows you to login with your Google Account. If you sign in and enter some values, it will store them. The next time you visit, the values you entered will be populated. If you enter new values, those will be the ones stored and populated on your next visit. Check it out. Here’s the source if you want to look at it. It takes advantage of the following api functionality: memcache (to avoid hammering kitco), users, and datastore.