I understand the traditional way is to Scrub the high points yet I've been following a scrub thread where it sounds like scrubs are "the most unused of the planes".
How do you do it? I've heard of using other bench planes, power jointers, planer sled jigs, etc. For purposes of this discussion, lets assume the board is 4/4 stock 5" wide x 30" long.
(Added, after Brian's comment): To put it in perspective, I'm not talking about a "corkscrew" board, just one that isn't as flat as you want/need it.