In google but not yahoo

I found this peculiar, I am indexed by Google but they don't acknowledge my backlinks, that i know of(pain in the ass Google). But yahoo is is the other way around, it has two backlinks but not site yet. Any suggestions of why?

Edit: Also, Does anyone know what theme this is? I have seen it on multiple blogs and I'm interested in getting it.
http://www.topweddingplanningguides.com/

Edit edit: It's studiopress

If it is a new site, I have found both Yahoo and Bing can be between 2 and 6 weeks behind Google.

I've noticed something similar for my site that I started mid December 2010. My homepage is now ranked in position 6 of Google, but I am nowhere to be found on Yahoo or Bing. Very strange that even after 3 months my Yahoo and Bing serp hasn't changed, but Google just continued to rise. I'm thinking its because I have an exact match keyword domain name, maybe Google gives more power to these than Yahoo or Bing...

I heard Yahoo does that on purpose to differentiate itself from google, if people see the same results on yahoo they wont come back.