All idioms are learned; good idioms are only learned once.

That’s the goal anyway. And it helps to have a photographic memory. My memory is more along the lines of finger painting, so I like to keep notes online:

1. Make a ringtone from a DRM free song in iTunes.
2. Hold down on an applications until the icons start wriggling to arrange application icons.

I’ll be keeping my complete list of iPhone usage tips in a TiddlyWiki.