Gmail has launched a new service where you can use GMail to manage your email from your domain name. This is great if your webhost doesn't provide enough space for email. Example: If you have a domain name abc.com, you can create a mail address like
admin@abc.com and all mail from here will go to a gmail account and you can even send mail from
admin@abc.com.
Microsoft has too started a similar service as a part of the new windows live network.
If you want to sign up, go here.
https://www.google.com/hosted/Home
Note: You must be able to change the DNS settings of your domain name for this to work.
For more info:
http://slashdot.org/articles/06/02/11/1421200.shtml