have a new post.. saying that it was an error in their part and they were trying to integrate the open id in to blogger.. etc etc.. if u want to know how to create an open id, buzz have got a link for the same.. That article is nice, but the same is for advance users.. so better that a normal reader/blogger reads till the paragraph juz before "Master Your Domain". If you still have some issues with Open id, here is the article describing Open Id
Here are the stuffs you can do..
1. Sign up in www.myopenid.com
Choose ur username wisely because ur openid will be the username.myopenid.com
2. Create a profile
3. Once u create the same.. include the below said two statements on the head portion of your blog
<link rel="openid.server" href="http://www.myopenid.com/server" />
<link rel="openid.delegate" href="http://USERNAME.myopenid.com/" />
*USERNAME is the username you registered
Once you have done this you can go to the blogger comment area. Choose "Any Open ID" from the login... Type in your address and there you go. (You have to be logged in to the myopen id account, in that browser.) The Nick name You have given in the profile will be displayed there as your text and that too with your U.R.L . Ain't that cool?
Vin have said the same here
There are other providers for open id (A search in google will bring that up or a list is here ) Check with their documentation and its easy. and secures you from comment spoofing!