I bought myself a domain doorul.com from ixwebhosting. Doorul is supposedly a cuter version of a doodle. I bet you wouldn't want to hear about the associated trivia. So, moving on to the interesting parts.
Setting up a custom domain name support in blogger.com is no brainer. A very nice documentation can be found here.The DNS server ghs.google.com will respond when somebody queries for my domain name dev.doorul.com
Cut-n-paste of debug trace from nslookup:
dev.doorul.com, type = A, class = IN
type = CNAME, class = IN, dlen = 13
canonical name = ghs.google.com
ttl = 75012 (20 hours 50 mins 12 secs)
Aliases: dev.doorul.com, ghs.google.com
Now see what happens when somebody accesses my previous blogspot url. The packets captured with ethereal look like this.
GET http://devdiary-naren.blogspot.com/ HTTP/1.1
HTTP/1.1 301 Moved Permanently
Other popular blogging sites like wordpress also allow you to have custom domain. Incase your blog site doesn't provide the feature you could use domain redirection feature that most providers offer for free. You can get your custom domain say http://blog.dumber.com redirected to your blog http://dumber.dumbererblogs.com