Whoever knew what ICONN (the Connecticut statewide library catalog) holds? In a search last night, I discovered an incredible resource. The Connecticut State Library has digital collections!
The Connecticut State Library Digital Collections website (http://cslib.cdmhost.com/) has less than comprehensive but very in depth coverage. Topics include "Account Books, Diaries, and Journals," "Courts," "Merritt Parkway Construction," and more. Within those topics, you'll find everything from a photo of the apple orchard that once stood at the start of the Merritt to the diary of Matthew Grant, the first surveyor of Windsor.
While it may not be immediately apparent, this website is very helpful for genealogy research. Start out by reviewing the topics covered. As a genealogist, you'll probably never use the Merritt Parkway material. However, you might find the employee records of the Colt Company incredibly helpful to your research. Once you've done that, make sure to open the topic links. Buried three pages into the "Personal and Family Vital Records" section is a index to early 19th century marriage intentions in Woodstock. A key resource may be hidden several pages in, just waiting for you to find!