How much bandwidth is enough?

At the beginning of last month our ISP, Telkom Internet, increased their bandwidth allowance from 5 Gigabytes to 9 Gigabytes a month.

And this month, for the first time since we started using ASDL broadband five years ago, we reached the end of the month without having to buy extra bandwidth, and with some to spare, which I hope carries over to next month.

Internet bandwidth usage, August 2010

That's good news.

But I'm not suddenly going to relax and start watching bandwidth-hogging stuff like...