Upload & Sell: On
+1 on the Yongnuo 560's, although I use the newer 560II version with the digital display.
Very reliable and I love the fact that they're dirt cheap. $60 for the regular version or $80 for the digital version. Like LivLif said, I don't have to worry about having one fall over on a light stand or dropping them, because worse comes to worst, they're not that expensive to replace.
I still use a SB-910 on camera, but for OCF, the Yongnuo's rock!