A link to historical information about the town, including a geologic history, is available here or through a link from the Town Historian's page, above
Historic Maps of the town
Pictures of the town. This page actually has links to several series of pictures in various categories. Go to History & Culture for an excellent series of pictures of sites of historic interest. All the pictures load at once, so the initial download is slow, but it is a nicely designed site which moves quickly after the first download.
The Web Page for the Library of the Town of Colonie, The William K Sanford Library. They have some local history and the librarians are very helpful.