Right now, for example, I don't know the % effectiveness of the subscriptions, I do not know if the emails are getting me traffic or if everybody is ignoring them.
This is also, really easy! Just, in the URL generated, instead of, e.g.
More info, here: http://analytics.blogspot.com/2009/03/tips-for-tracking-email-marketing.html
A handy URL builder, here: http://www.google.com/support/googleanalytics/bin/answer.py?hl=en&answer=55578