Plus, he's giving away an excellent Tamron 24-70mm SP f/2.8!
This is an incredibly informative video from The Slanted Lens that details an excellent way of shooting outdoors and balancing strobes with natural light. Some of these tricks were things that I actually never considered such as stopping down the camera and upping the flash to see exactly where the light was falling outside. Now that I think about it, it's so simple that I should have been doing it from the start, but that's why I love these videos!
If you've never worked outside with your strobes before or you've had trouble getting good results, you should definitely check out this video!