I've lost track of the number of times I've woken up the morning after a networking event to find half a dozen new unsolicited newsletters in my inbox. Handing someone my business card does not - in my mind - constitute my permission to add me to their newsletter mailing list.
I publish a newsletter - and I have vowed that starting next month I'll publish it on a regular schedule. I may even ask you if I can put you on the mailing list. I won't do so just because we met once at a networking event.
Seth Goden talks about Permission Marketing: Getting your permission to martket to you. I am a firm believer in that.
Blogs are permission marketing. You are reading my blog or it's RSS feed because you want to, not because I've decided it is time to remind you that I exist. Furthermore, you are reading my blog at a time and place that is convienient for you.
While I view email as an interruption, I realize that you may not. Some people like email a lot, and for those people, I've made it easy to subscribe to this blog via emal.
I've also noticed that there is almost no overlap between my blog's RSS readership and my newsletter readership, so I am reluctant to drop the newsletter at this point.
So I'm keeping my newsletter for the time being, but I won't subscribe you to it without your permission.