(I meant to write this as a comment to @Sha Wiz Dow Ard but it got too long. TLDR version: "me too". This is a clarification of what I think the question amounts to, not an attempt to answer it.)
I have a few tag subscriptions but I find the email interface quite ungainly; I receive a notification only nightly, when everything else on SO is basically instantaneous; and very frequently, by the time I actually read my email, I have already read (and perhaps even answered) the question that the email highlights.
What I'd like to see (too?) is a little colored blot in the upper left corner of the SE web page when there's a new question in a tag I'm subscribed to.
Ideally, the email should be completely unnecessary, and the subscription integrated to the site's general user interface. If that cannot happen, at least it would be useful if there was an option to only receive email when I have not already read the question.