If you are using FBA to sell your products on Amazon, there are some fee changes that go in effect today (February 01, 2011).
The largest increase is for oversize items, which have an increase from $1.00 Pick & Pack to $6.00 Pick & Pack. Weight handling has been decreased from $.40 per pound to $.37 per pound.
What is oversize you might ask? Oversize is any item that has a volume greater than 5,184 cubic inches (length x width x height). Thus a 2′ cube would be 24 x 24 x 24 or 13,824 and would be considered oversize.
For more information, check out your Amazon Seller Central Dashboard.