How are you open rates, bounce rates, or "spam/junk" complaints comparing to other email marketers?
While there's data on this out there from big business, here's one email benchmark report that focuses on small businesses that's worth a look.
The report, from email marketing service provider MailChimp, states it's from a scan of more than 30 million emails done by their client base (which they estimate is about 70% companies of 1-10 employees, and mostly do-it-yourselfer email marketers).