As part of the "New Blogger", a custom domain feature was implemented allowing you to point a domain name you own at your blogspot blog. I did this with WITFITS some time ago, meaning that you no longer have to type witfits.blogspot.com, you can use the more personalized www.katonian.net. The old address continues to work--it simply redirects to the new domain--meaning you don't have to worry about outside links to your site or content suddenly breaking.

One problem people like myself discovered was that with the instructions given by Blogger on how to do this, you end up with only the www version of your custom domain pointing to your blog. That is to say, originally www.katonian.net would work, but simply typing katonian.net into your browser would not (in my case it sent me to a landing page at GoDaddy). To fix the problem of the non www domain name not pointing to Blogger, I simply had to log into GoDaddy (my registrar) and use the forwarding option to specify that katonian.net points to www.katonian.net. Bingo bango, it was all working correctly in a few minutes.

As a service to others who might use GoDaddy and Blogger together to set up a custom domain for their blog, here is a modified reprint of the Blogger directions including the "fix" I mentioned above. Hope it proves helpful.

Culled from Blogger Help: How do I use a custom domain name on my blog? and Blogger Help: How do I create a CNAME record for my custom domain?

Acquire A Domain Name And Point It To Your Blog (GoDaddy instructions)

1. The first step is to search for an available domain and purchase it. It can be .com, .net, .info--whatever you want. The process is out of the scope of this post, but you're probably looking for the cheapest deal since you won't need anything other than the domain (i.e. you really don't need any fancy hosting services or what not). One extra you might consider, though, is using the Private Domain Registration service. It costs a small fee, but the purpose is to hide your personal information behind a proxy company. The name, address, and telephone number of the person who registers a domain is part of a publicly available database known as the WHO-IS system. Since some of us aren't exactly comfortable just putting that information out there where everyone can see it, this service allows us to mask that.
2. Once you have your domain purchased, log into your account at www.godaddy.com.
3. Open the Domains tab and select My Domain Names. You'll be directed to the Domain Control Center.
4. Click on the link to the domain you are interested in modifying (i.e. the one you just bought).
5. Click the Total DNS Control And MX Records link. This will take you to the Total DNS Control Panel.
6. Click the Add a New CNAME Record button.
7. For the Enter an Alias Name, enter only the subdomain of the address you want to use for your blog. For example, I wanted www.katonian.net as my address, so I enter www here. For Points To Host Name, enter ghs.google.com. Press OK button when done.
   
8. Now, in my case, www.katonian.net points to Blogger, but katonian.net does not. To fix this, click on Domains to return to the Domain Control Center.
9. Click on the Forward arrow button in the menu bar.
10. Check the Enabled radio button and set Forward To to your domain including the www, so in my case I enter www.katonian.net. Press OK button to finish.

Set Up Blogger To Use Your New Custom Domain For Your Blog

1. At this point, you have a domain name, and the DNS servers know to direct people to Google when they want to see your blog. But Google hosts lots of blogs, so you have to make sure the right one is associated with your custom domain. Log in at www.blogger.com and click on the Settings link for the blog in question.
2. Click the Publishing link on the Settings tab.
3. Click the Switch to Custom Domain link.
4. Fill in your full domain, in my case www.katonian.net, in the box provided.
5. Click Save Settings at the bottom.

You're done. It may take anywhere up to a day or two before your custom domain name starts working.