Great lighting videos
Lastolite has a bunch of really excellent videos on using all their neat gear: backgrounds, reflectors, umbrellas and much more. Although the videos naturally do focus on Lastolite's own products and some of them just show how to pack and unpack, there are lots of great generally applicable tips on using softboxes, reflectors, backgrounds and other kinds of lighting gear.
And if you are into lighting and want to watch some more videos, The Grip Guide might be interesting to you too. This Pixel Corps production comes out with irregular intervals, but the archive consists of 11 videos. The show is aimed at people working within cinematography and does deal with much larger setups than most of us use for our strobes and cameras, but you will find plenty tips, which are very useful for studio flash or off camera strobe work.