I’ve just added Feedblitz’ subscribe via email as an option on this blog. (under categories on the right)
If you think about it, subscribe via email is something every blog should have as not everyone knows what a feed is or how it all works. For every one person that knows about feeds, there are probably 10 that have no idea. However, almost everyone knows what emails is. So having a subscribe via email is an option all blogs should have.
There are quite a few services out there and one seems to be just as good as the other. I like Feedblitz as it allows me to see who’s subscribed to my blog and I can export the emails too. For an additional cost, I can also design the email templates. Other feed to email services include R|Mail, RSSFwd & Yahoo Alerts.