> How many request (via http) to Geocoding web service each users can
> send each day ?

http://code.google.com/apis/maps/faq.html#geocoder_limit

> For all applications that use API V2, must be upgrade to API V3 to
> continue working ?

No.  V3 Maps API is an alternative, not a replacement.

If you mean V2 or V3 Geocoder service, see
http://code.google.com/apis/maps/documentation/geocoding/
Users of V2 Geocoder are advised to change to V3

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