Yahoo, PayPal Team up to battle Google Checkouts
Yahoo has announced partnership with Ebay, PayPal to offer an express checkout system similar to Google Checkouts. Search on Yahoo and you will notice small blue icons beside search results. With the Yahoo! PayPal Checkout Program, a blue shopping cart icon appears next to your ad in Yahoo! search results. This can help your ad stand out, and let customers know you offer PayPal Express Checkout. This is very similar to the Google Checkout program.
Here’s a note from Yahoo’s Search Marketing Blog:
“Here is how it works: When a user goes to Yahoo Search to find an item or service, the results page may include Yahoo Sponsored Search results matched to the user’s query. If the merchant has joined the Yahoo PayPal Checkout program, a blue shopping cart icon will appear next to the merchant’s name in the Sponsored Search results. By clicking on the ad, users will have direct access to a safe, secure purchasing process that does not require any additional credit card information and can be completed in just a few mouse clicks.”
A Screenshot : (Image Source: Google Operating System)

This will create a lot of competition for Google as Paypal has been popular in this area and highly reliable and secure site for transactions, so probability of people using Yahoo-Paypal is more compared to Google Checkout..Only thing is people are already much more familiar to Paypal.
Anyway..always the best survives..
[ Yahoo - Paypal ]