Rod - I did the same and most of my post evaporated as well.
I have used NukeAlurrt and what I like about it is that you can create custom tokens which take personalized parameters, and therefore you can pull content into each email which is unique to each recepient. You can also go beyond the opt-in and opt-out model to determine who will receive your emails based upon SQL queries.
Thus I can use this for business applications in the following manner - in conjunction with Enterprise forms, which is my main working module - I can query an Enterprise form table to see which students have selected a particular guidance counselor in a student application. in the same or a similar query I can join to a guidance counselor response table to see if the guidance counselor has or has not yet provided info on this student. If not, info regarding the student gets added to the email. In fact, info on each such student gets put into the single email, so the guidance counselor gets an email report with a list of "Here are the students for whom you need to provide information ..." So this data is pulled with the customized tokens for the email content. This query runs second, however ... the first query finds a list of all guidance counselors who have such students, to determine who will get an email (a distinct list) ... and then as the email is being sent, the other query runs to create content for each person individually. Guidance Counselors who haven't been selected or who have already responded for all students don't get an email notification. That is an improvement over using a DNN role for Guidance Counselors (which role does exist but I don't use it for this).
This kind of business need is what I find so necessary ... we'll use NukeAlurrt for regular email campaigns in more customary ways as well - but what excites me are the unique ways it can be used by being manipulated with SQL based results. Combine this with Enterprise forms which can run SQL queries at each work flow step to run any sproc ... imagination is the limit.
I'm looking forward to upgrading to NA 3 ...
edit: what I was wondering, though, is if Bulk Email or other such modules provide similar functionality as I describe here.