GoogleCheckout
It has been heard that Google has recently registerd the domain name Googlecheckout.com and it can be used something like paypal.com.
If this is going to be true than it will defintely be a big threat to paypal system as Google has already proved that they are the best through their innovative products and services like Gmail, Earth, Search, etc
However nothing is clear till yet as Google hasn’t revealed any information on it and therefore you may hear a lot of rumours on this domain’s (googlecheckout) purpose.