If anyone seems to be having trouble directing visitors to your blog through your custom domain, the following information may help. I obtained bits and pieces of what to do from both Google Blogger's help section as well as Godaddy.com's help topics so if you aren't using godaddy or blogger, this information will not help you much. If you have your blog set up and domain name purchased, these steps will help you direct visitors to the custom domain.
You will have to edit DNS (Domain Name System) Settings before you can link the purchased domain name to your blog. To do this you must enter your CNAME (associated with blogger) into your Godaddy account.
1.Log in to your account at www.godaddy.com.
2.Open the Domains tab and select My Domain Names. You'll be directed to the Domain Manager page.
3.Click the domain that you'd like to use with your blog.
4.select the tools tab and then select DNS manager (redundant I know).
5.Under your customer domain there should be a link that says "edit zone". This is to edit zone files associated with your domain name. Hint: if you are following Google's instructions posted for Godaddy.com, they are misleading and may be outdated.
6.You can click "quick add" however there should already be a listing for a top level domain with "www" already entered. The sub-domain feild may have an @ symbol in it. Delete the @ symbol.
7. Enter ghs.google.com as the Host Name. Specify a TTL or use the default setting of 1 hour.
8. Click save settings at the bottom of the inline frame.
Your settings should take hold in about an hour however it can take up to 48 hours for it too work so don't get discouraged if you can't get you blog to pop up when you type in your domain name. Also, you want to make sure you update blogger with your domain name as well if you haven't done so already.