I read a few days ago that people were registering other's blogs for publishing on the Kindle. Normally this wouldn't make a difference (with someone else "claiming your blog" falsely).
The reason it makes a difference here is if ANYONE views your blog on a Kindle - you are paid. This means if someone else registers your blog - THEY get the revenue.
It can be corrected, and the proper person will be credited - but I'll bet the majority of you didn't know about this.
Just to test this out, I registered some very popular blogs, in fact ... one I read every day. Then I deleted it from my "accounts page".
Go claim your blog now.