It's great when people with mad skills give back to the rest of us. Especially when it is done with no pretense and just a love for the sport and to help other riders.
Jabberwocky, a member of my local mountain bike club MORE, is one such rider. He posted a fantastic tutorial/pictorial of the right way to do a bunny hop over in the MORE forums. You've got to check it out!
I've written about some other log hop and bunny hopping resources before, but I'll surface some of the links below:
Beginning and intermediate riders:
Rickyd hippity-hopping over a log
Flowmaster's bunny-hop video tutorials
Jabberwocky's bunny-hop pictorial street style
Advanced riders try these techniques - if you dare:
Ryan Leech riding fences and railroad tracks
Crazy urban trials riding
Have fun!