Interesting controversy stirring up at the moment is how eBay have banned their sellers from using Google Checkout. Their excuse is that it’s an untested and potentially unsafe product, but Google have a long history of making/receiving payments with their Adsense products and more recently their video portal. Populary opinon is that eBay is afraid of the competition that Google Checkout gives eBay’s own payment system, PayPal. This is despite the obvious fact that Google Checkout and PayPal are very different products, althoguh their is a bit of overlap.
eBay also recently banned RapLeaf which provides a commenting and rating system for buyers and sellers on ecommerce sites. Again, the popular opinon was that eBay banned it because it competed with their own rating systems which is just ridiculous.