Javascript: As my "Javascript: The definitive guide" by Flanagan is sadly out of date, while waiting for a fourth edition I lean on the Sitepoint book "Simply Javascript" by Yank & Adams. C#: If you know some C# then "Effective C#: 50 specific ways to improve your C#" by Wagner is fantastic; a new version for .Net 2.0 is due out imminently. SQL: "The Guru's guide to Transact-Sql" by Henderson - the version I have was written in 2000, not sure if there is a 2005 version; but it is comprehensive.
"If you reward everyone, there will not be enough to go around, so you offer a reward to one in order to encourage everyone." Mei Yaochen in the 'Doing Battle' section of Sun Tzu's: Art of War. .
