mellis,
I understand the need to keep the small "core" set of examples under your control, so that you can easily verify with 100% certainty that they work and are the same examples distributed with the arduino.
The only reason I brought this up was because of this thread where someone was having problems with the LiquidCrystal library (he's not the first person to have the same question either). I wanted to fix it so that nobody has the same problem anymore, but it's in the Tutorials section.
To answer your question, it seems to me that pretty much everything in the right-hand column of the tutorials page should be moved to the playground.
Thanks for listening!
Tim