Richard Dibon-Smith Website
http://www.dibonsmith.com/menu.htm
This one has not been maintained in about five years. I stumbled upon it while looking for information about binaries.
Shortly after it was launched in 1995, Richard Dibon-Smith's CONSTELLATIONS website won a mention from the Griffith Observatory for its fine work.
It seems to have started out as a guide to constellations with folklore, maps, etc. However, it grew beyond that. Among the tools I found is a key to the abbreviations of discoverers in the Washington Double Star Catalog. It is under the Binary Database: http://www.dibonsmith.com/bin_data.htm
His
The Star Data Tables (http://www.dibonsmith.com/data.htm ) are, again, organized by constellation. Within that you will find the Hipparcos catalog number, magnitude, distance, parallax, and a graphic of the binary's orbit. (if one is available).
All in all I found this to be a noteworthy effort. I bookmarked it as an aide in targetting binaries.