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its very normal for a new phone. lots of stuff to update. usually its done over wifi and people dont notice
I haven't noticed it, but Android OS sort of covers for a lot of things, like Picasa, Contacts, Calendar, Tethering, etc.
I said 'etc'. Go into application settings and look at what's under the running tab. And yeah, your data usage is excessive. That's equivalent to one month for me with no tethering.
You could list which are running. You can also see how long they have been running. You can post the biggest offenders here and lets see what we got.
Look at your sync settings.
I'd be willing to bet problem solved