
I LOVE ingenuity above all things (well within reason)...which is why i am an unashamed fan of the folks at Photojojo...
They scoure the world (again within reason) for stuff that is clever, clever, clever when it comes to photography.
Check out this puppy....a white balance 'card' in your lens cap....doh...of course?? Why didn't I think of that?

Instead of carrying seperate 'white card' so you can set your white balance correctly in post production (we all do that right?....Right??) You can have your white balance gizmo on tap...or more appropriately on lens cover.
By having this device all you do is whack your camera into custom White Balance mode, take a shot with the White Balance Lens Cap on, and your camera creates a perfect profile of the actual lighting in front of you. How insanely simple is that? (You don't have to answer that I was being rhetorical).
It's so clever I wish i had thought of it. Hell maybe I'll tell my next Dinner Party crowd I did think of it (um...kidding...)
For more info head to Photojojo..Tell 'em I sent you...they have no idea who I am but it will make me feel better.
Mel.