iCloud and other background services that I use seem to assume that Internet bandwidth is unlimited. As soon as I launch my Lion MacBook, hundreds of megs of updated documents, software updates, mail, notifications etc are downloaded.
This is desirable when I'm on broadband, but when I'm travelling and tethered to my iPhone, it's expensive.
Is there a way I can block all programs except Safari from using bandwidth? I could dual-boot a linux distro, but that seems overkill, and I'd lose access to mac apps.