From the Profoto YouTube Channel:
On March 19, Profoto and Mark Wallace did a live webinar on high-key and low-key lighting. Did you miss it? No worries. The webinar was recorded and is now available as a video.
Profoto hosts free webinars once a month. Click the link to sign up, and we'll send you a friendly reminder when the next one is about to start: http://www.profoto.com/webinar
Note: Be sure to check out Mark's uses of a gobo around the 32 minute mark. It's pretty amazing to see what a few holes in Rosco Cinefoil can do for you.
B&H carries the Profoto B1 500 AirTTL Battery Powered Flash and other Profoto products.