I was reading about Scriptome on perl.com the other day, and thought that much of the code in the Scriptome would make an excellent tutorial on Perl one-liners.
The format of each script helps it to make more sense than many one-liners - each script expects an input file, and results in an output file - and so reading these sciptlets is eased by this underlying decision. Because there are scripts for both Windows and Unix/Mac OSes, you can also see how those systems differentiate for use in one-liners, which can help you to develop your own scripts across the platforms.
I think that anyone looking to create quick scripts or one-liners would benefit from looking at this collection of code. Noting the use and meaning of flags, or just noting the appoach for creating these tiny snippets is well worth a look.