Here's an interesting little flash for all you bargain hunters out there. I picked this YN462 from our local car boot sale for £4, and I've been pretty impressed with what it can do.
The Yongnuo YN462 is a simple flash compared to it's more expensive cousins, but it does have a variable power output, so it is a useful tool if you want to use it for off-camera flash.
There's no slave modes, but the YN462 can swivel it's head through 270 degrees and tilt it up 90 degrees. A built in bounce card and wide angle diffuser give a little control over the beam pattern, but there's no ability to zoom the head itself.
You're going to be using the YN462 in manual mode either on the camera or off with some sort of wireless trigger. The box guide number is 33, which means that at ISO 100, with a subject 3 metres away you'd be shooting at about f/11, powerful enough for most portrait work.
One of the key features you need from a strobe that you're going to be use off-camera is the ability to alter the power so that you can balance the exposure or create different light levels within the same scene. The YN462 does this in an unusual way - with a dial. This means that you do have an ultra smooth way of getting from full to partial power, but you're going to have to guess how far to turn that dial if you want to drop one, two or three stops of power, so you'll have to do a little more chimping than usual.
So keep your eyes open for a Yongnuo YN462. It may not be the most sophisticated speed-lite out there, but with a little practice it can help you get the job done.