I use an LED video light like this for fill light in my videos. It mounts on a hotshoe or a cold shoe. My video mount can either be used with a dedicated video camera like below or with a DSLR shooting video.
I have not used this light for still photography but, I have found that it is much softer than a direct hotshoe flash since the size of this light is considerably larger in size than the flashtube of most hotshoe flash units. This light is extremely portable and provides an amazing duration of light when using either a camcorder battery or six AA batteries. I use Sanyo Eneloop rechargeable AA batteries.
http://www.amazon.com/Dimmable-Digit...video+lighting
I normally shoot stills with flash. I bounce my flash for stills and modify the light with a Joe Demb Flash Difuser Pro (DFD). I have recently been using a four bulb compact flourescent softbox (daylight) for general fill lighting with a 430EX flash bounced and modified with a DFD for main light. I first used the flourescent softbox because I had it setup for some video and just decided to try it for my dog postraits. Sometimes being lazy, I find different ways to shoot.
The combination of flash and CFL softbox works pretty decently. I posted this image under the pets and people category. I was able to maintain definition in both the black carrier and the dog's white coat. I was pleased and surprised at the quality of light.
Here are a few more shots using the combination of CFL softbox and a bounced and modified 430EX flash...