If you're ever going to grow your beta testing ops, then CenterCode is definitely a good option: http://www.centercode.com/ http://www.centercode.com/ TiVo uses

If you're ever going to grow your beta testing ops, then CenterCode is definitely a good option: http://www.centercode.com/ http://www.centercode.com/ TiVo uses it for betas...actually, I'm not sure if I can tell you that under NDA :P For smaller stuff, I'll also recommend Mailchimp for basic mailings. They're here in Atlanta and those guys rock. A killer product from a killer company.