My Favourite: Online Tools

Convert a web page to PDF
http://pdfmyurl.com/

Characters to Hex Unicode Converter
http://code.cside.com/3rdpage/us/javaUnicode/converter.html

Youtube to MP3 converter
http://vidtomp3.com/

Learn Chinese: Chinese Dictionary
http://www.blabi.com/

Image Edit
http://www.blibs.com/editor/

Color Scheme Generator
http://www.wellstyled.com/tools/colorscheme2/index-en.html