Vimcasts publishes regular screencasts about the Vim text editor. Episodes are kept short - typically less than 5 minutes, never more than 10. The aim is to provide something in each episode that you can take away and use.
Clear explanations, more readable than the rest.
Good research compiling severa sources in a usable format.
Shell-fu is a place for storing, moderating and propagating command line tips and tricks.
Programming questions and answers site collaboratively built and maintained by programmers.
All well known, but pedagogy by repetition never hurts...
Most of the time you'll probably depend on the (usually) default inner join, but occasionally you'll need an outer or cross join
This illustrated article shows SQL joins and explains how subselects can be easily avoided
Interesting tutorial for the Bash shell refugee
Write one-line Perl commands and small Perl scripts that surpass the limitations of the UNIX grep command
A plugin that allows for easy commenting of code for many filetypes.
A Short, Comprehensive, and Personal Summary