Thanks for the mention guys (and gals)! I'd also like to point out that we have a turn key email newsletter program available on our sister site, Web Hosting, VPS and Dedicated Servers by eBoundHost. And the first month is free.
Just write what you want, keep it "chatty" and "light" and you will do fine. I get all sorts of nice notes from my bi-monthly newsletter and you will too if you write it they way you would want to read it.
I would also make sure that you have permission to email them also. Some people will give you their email but don't want anything...Just trying to save you some grief of spam allegations.
You're CAN-SPAM complaint just as long as the subject line is not misleading, there's a way to opt out and you have your physical address in the email. If you're complaint with that you can spam everyone to death.