Hi Ana Rita,
Wow! What a great idea. I just talked to a developer about this and he said this is exactly the kind of integration we want to work on. He had never seen that Gmail plugin before.
One of the reasons we're going to be focusing on CRM features later this year is exactly for things like this. We want to be able to integrate with Google contacts, Postini and other systems so that you can see your OwnerRez guests in those places.
Imagine having your OwnerRez synced to your Google contacts so that when a guest calls your cell phone, their name/info shows up in the caller id. There are *lots* of practical applications to this.
I've added this to the dev roadmap.
Have a great day,