PowerShell Cheat Sheet, Punctuation Edition

I've posted before about some of PowerShell's sometimes-maddening punctuation - parentheses, braces, and brackets, oh my! This time, I've decided to do something more substantial about it: Make a cheat sheet. Only I actually need your help to make sure I've gotten all the little bits of punctuation, and their various uses, covered - including usage in both the help file syntax as well as on the actual command-line. If you'd like, download the draft at  http://files.concentratedtech.com/pilot.pdf , and look it over. It's only a couple pages long, and if you find an error or something missing, drop a comment here on the blog. What other stuff would you put in a PowerShell cheat sheet? What are you  continually  having to look up and remind yourself of?