Nearby Stars Database
The stated mission of NStars "is to be a complete and accurate source of scientific data about all stellar systems within 25 parsecs."
The website (see below) includes search tools and links to an interactive forum.
As of 1 January 2002, there are 2,633 stars in 2,029 systems in the database. As of 29 January 2008, the site is closed, displaying the message "This site is currently undergoing a major redesign and will be returned to service at a later date."