If you're serious about your work, then you'll definitely want a three-pack of Nasty Clamps tucked away in your gear bag.  This really is a fantastic set of tools for mounting multiple strobes*, point 'n' shoot cameras, digital audio recorders, smaller HD video cameras, or just about any other medium-weight items** that can be attached to a standard 1/4"-20 tripod screw.

*Note:  This Three-Pack of Nasty Clamps does not include 1/4"-20 to Hot Shoe Adapters (which are really quite handy lil' gizmos), and which you'll certainly want if you're looking to attach any sort of hot shoe mountable lighting accessories to your clamps.  Those adapters can be purchased HERE on the Nasty Clamps site.

**Another Note: Officially, the heaviest piece of gear that you can place on a Nasty Clamp (without having the flex-arm bend) is about one pound (roughly 450 grams).  Unofficially, much more weight than a pound can be placed on the clamp, just so long as the flex-arm is pointed straight up or straight down (i.e.: underslung).  Just use your common sense, and don't mount a multi-thousand dollar piece of equipment onto your Nasty Clamp and then walk away.  Again, use your common sense.