W3C HTML DOM Another DOM reference useful if you can't remember the HTML properties and methods of HTML elements
JSTL Docs Good reference for all JSTL tags, helped me very much during SCWCD
TutCity Has a wide variety of tutorials. I read a few tutorials on Struts and I liked them.
WhatsOnIndia Well this has nothing to do with Study. This site contains program schedule for almost all of the Indian TV Channels. They even have an option of SMS notification, but I haven't tried it yet.
Enjoy, I'll post any other good sites if I find them here.
QT Tab Bar Really good tool, to add the "Up" button in windows explorer (which is missing in Windows Vista) and tabbed navigation to windows explorer. Installation steps can be found here.
This one is actually very useful. After installing one plugin and changing the look and feel, this is how my windows explorer of vista looks. The search box is very useful. It searches for files and folders in the current directory with the name that we type (within milliseconds). Very useful if a folder contains 100s of files and we know something about the filename (like part of the name or extension etc).