I got to visit the independent Northshire Bookstore, at 4869 Main Street, Manchester Center while on vacation with my family in Southern Vermont last month, and took the time to ask a member of their staff what they think has attributed to their successful 34-year run, counter to the long-term downward trend in independent bookstores.   Two things, she told me:  1) a great high-traffic location and 2) Vermonters really do support their locally-owned businesses.  In addition, I would add the following based on my visit: 3) great food and coffee, served right on the premises, 4) a knowledgeable staff making recommendations on titles, 5) frequent events, 6) and a terrific web presence, including a very robust website, an e-Newsletter, and followers on Facebook and Twitter.