The LiPoly battery itself has no memory effect like the NiCad, that's true. But the controlling thing gets messed up if you charge it unwisely.
Anyhow, I read it in a bunch of manuals from various manufacturers, I follow the principle and get rewarded with great battery life on my devices. To each his own, I guess, and I see it is right up there with the Mac vs PC and Crumple vs. Fold discussion
EDIT: I noticed, this is not a battery thread.