This page contains links that you may find interesting.
Contains info for all the schools in the Hampden-Wilbraham school district. There does not appear to be too much info on alumni, but there is some interesting content that will give you an idea of what Minnechaug is like today.
There appears to be no other significant Minnechaug pages on the web at the time of writing (at least none I can locate). There is the Classmates.com site, which does contain e-mail addresses for about 1600 (total of all classes ever to attend Minnechaug) e-mail addresses. However, unless you pay the annual $30 fee the amount of things you can do is limited. Is it worth it? That depends... if you are mainly interested in contacting class of 1978 members, the site you are now looking at has about as many Class of 1978 people listed as classmates.com. In addition, the site you are now looking at has far more content dedicated to the Class of 1978, and best of all it is totally free!. Classmates.com site is an interesting site to visit and has listings for many alumni. $30 per year is not a lot of money these days, so if you join up and find it not to your liking it is not a big loss. I have located a number of "long lost" friends using it, so to me it was worth the $30.