What for a Google Maps API Key?

Hi,
i just wonder for what the Google Maps API Key is necessary?
Just installed and configured all withou a key....and it works?!

How must i set up the Version vpr API v3?
Just type in "3" or "v3"?

Regards
Fenris

Hi.
About API key you can read on google's page for Maps API.
The main thing - to get statistics.

As for API Version: you can "fix" definite version for google's maps API loading - set this field. In this case I add version parameter to API loading.
You have to enter only values, without "v".
For example, curent value you can set to 3.11