Flying seems to be something that's extremely easy for some, and nearly impossible for others. I've only tried doing it once, but I couldn't get it to work.

Heh, I might as well make a list of the things I can and can't do, since I've only had one real LD:

Can do:
- float
- talk to DC's
- "dream spin"
- explore dream places
- jump really high

Can't do:
- fly
- use light switches
- summon things
- find my dream guide

I don't know why I can't do some of these things. Part of it is probably due to the placebo effect, but some of it almost definitely isn't. Light switches, for example... in real life, I have nearly absolute faith that a light is going to turn on when I flip a switch... so why doesn't it work when I do it in a dream?