An Australian online retailer, Kogan, has just announced a 6.8% tax (really a surcharge) on users of IE7. (I wonder how IE6 users would be treated?)
To avoid the surcharge, all users have to do is switch to more up to date IE or switch to an alternative browser such as Chrome, Firefox, Opera or Safari.
One has to admire the pluck of such a retailer. More details at
http://www.kogan.com/au/blog/new-internet-explorer-7-tax/