A mini howto forward you domain emails to google and get a gmail interface for your emails using use google apps.
Register at http://www.google.com/apps/
The standard edition is free and can have upto 50 users.
Now Configure Mail
click "Activate Mail"
Follow Instructions for setting MX records
which are :
Priority Address TTL
1 aspmx.l.google.com 1week
5 alt1.aspmx.l.google.com 1week
5 alt2.aspmx.l.google.com 1week
10 aspmx2.googlemail.com 1week
10 aspmx3.googlemail.com 1week
The login page should be:
or you can set up mail.yourdomain.com [instructions]
select "Service Settings" -> "Email"
Tell google what you want the domain to be.
Update your dns records by adding a cname with alias mail (should match the google setup), points to host name should be ghs.google.com ttl 1 week
It may take a few hours for google and world wide dns caches to update making it functional, just wait a and and at some point your new mail.yourdomain.com should spring to life.