Creative Commons has been using CiviCRM for several years. A number of months ago we decided that for our annual fundraising campaign we wanted to streamline the donation process, possibly reducing it to a single click on the CC site.. About a month ago we launched our annual campaign along with a one-click donation process.
The process required a bit of custom coding, but fortunately very few changes to core CiviCRM code. Some of the main benefits of this method are: