Even when it looks clear, if there are still lees appearing after racking the yeast isn't all out and it needs to sit and be racked again. Wine yeast doesn't taste good... blech.
Since I'm typically impatient I bought a wine filtering machine. After fining and doing one final racking I'll drop the pickup into the carboy and strip any remaining yeast out with a 1 micron filter and then go straight to the bottle.