I've normally used Aweber opt in lists for my sites, but I'm in the process of setting up a Wordpress Blog site for a Hobby Niche. I've been told it's not good to have both a "feedburner/notify me of changes" form as well as an Opt-in form as I'm giving the visitor too many choices.
So for a Blog, what do you think I should use? Does an opt-in always win or am I missing something? ...or is actually ok to have both?