What Dynamic DNS do you use?

I wonder what dynamic DNS service do you webmasters here use or suggest?

I’m using GoDaddy and their integrated dynamic DNS is quite good. I can host my websites at one company and still able to use Google App for my own domain emails.

But with domains that bought on other company, I can’t do this. Is there any good and stable dynamic DNS service out there?

Any comment would be much appreciated.

godaddy doesn’t exist for me anymore. I hope they will get bankrupt as soon as possible.