I have always been hesitant to utilize email campaigns, mostly because I (like Patrick) consider myself an email newsletter hater, and I don't want people to hate me too. But I think Patrick brings up a good point, that people will be less likely to hate you for emailing them if they remember who you are and why you're bothering them. I get a newsletter every month from Dreamhost, so I'm never surprised or irritated when it shows up, because I expect it, and they're usually at least a little funny.