Hi Mr. Hether(ington?),
I'm guessingTrulia estimates the value off of the assessment figure. This house is assessed at $696,200 which by CT law is supposed to represent 70% of fair market value or in this case $994,571.
The Riverside and Old Greenwich markets are very hot right now but each house is individual and sells on its own merits. Neighborhood comps are great but unless this is a development with identical homes (which of course it is) the neighbor's sale may not help your price. After the folks bought that one not this one. There are also the parts of the equation that we as agents or owners can't always see or know - what was the timing involved, the sense of urgency, etc.?
By all means, put it back on the market - I know of two going on in the area shortly. Listen to the feedback and watch the traffic. The signed purchase contract will tell you that you've listed at the right price.