I recently got this in my email and I wanted to let the community know. Most of you who use Google Checkout will likely get the same email soon enough.
Update on Google Checkout transaction processing feeshttp://checkout.google.com/seller/fees.htmlQUOTE
Beginning on May 5, 2009, transaction processing rates will be determined by your sales volume during April 2009. Each month thereafter, we'll continue to use the prior month's sales volume to determine your transaction processing rate.
Visit the fee page for more specific details of how you might be impacted by the change.