"This is about 600% faster." - I love people making bold claims without making any reference to which platform they tested it on :] (ah, following the link they mention AS3 - flash actionscript?)
Bitwise math is good to know, though. I generally don't do it for highlevel code, but once there's a bottleneck, it can be worth it (usually ends up in assembly code then). Keep in mind that decent compilers know a bunch of these tricks already, which is good reason you wouldn't do ">> 2" to divide by four in C.