As a free Feedblitz user (so far), I haven't anted up to try the company's premium options, which would let me customize the update e-mails, offer real-time statistics and additional tagging options, but with Feedblitz 2 here, I'll definitely be looking into it - especially as the blog grows in traffic, content and subscribers. (Sign Up Now)
Since its launch, Feedblitz has become the de facto source for publishing blogs by e-mail, including a significant partnership with Six Apart's TypePad, which debuted in the last few months. It's good to see the company isn't resting on its laurels, but continuing to make significant upgrades for its user base.