In Hoboken NJ and other places around NJ and other states: Rita's Water Ice:

http://www.ritasice.com/locations.cfm

I stumbled onto this place over the weekend because my usual ice cream place, Ben & Jerry's, was packed with dozens of junior high school students and I don't like crowds. Rita's is a small place with a nice selection of ice creams as well as Italian ices and custards too.

I had the Blendini with Oreo's cookies and cream. Very nice.

It's not your traditional ice cream parlor and it's a chain but nice customer service and a good selection.