There are a bunch of real estate shooters using Yongnuo YN-560-III flashes because they are a very close second to the classic old Nikon SB-80DX flashes. SB-80DX are a great flash for manual real estate work, but are no longer manufactured. Nowadays YN-560-IIIs are only about $71 where as the SB-80DX is usually twice that when you can find it on used gear sites.
A cool manual flash controller (YN560-TX Flash controller) was announced in May of this year but wasn't widely available until a couple of months ago. A description of the YN560-TX is over at FlashHavoc and Pete Leong has a thorough description on YouTube of how to use the YN560-TX.
The big advantage of this flash controller is that it allows you to remotely adjust power level of your manual YN-560-IIIs right from behind your camera. It will also replace your RF-602/603 triggers and trigger all your YN-560-IIIs. All this for $58.
I've heard arguments both ways of whether adjusting the power level from your camera is important. Many people claim this is a big time savings. I'm sure many of you are already using the YN560-TX. How does it work for you?