[Martini78]

I know putting with the back of an Anser-style putter is not illegal because I've seen many pro's brush in short putts that way... in fact, I recall seeing Hensby do it on Saturday.

Turning the club around, toe-down to hit a shot left-handed is a lower percentage shot, but the benefit to it is that a player can actually hit a shot with loft on the club. If you hit a right-handed iron lefty, you generally hit toppers (using the back of the iron). In a Golf Digest article from last year, I recall Tiger stating he practices the toe-down lefty shot. He uses a 7-iron and can hit shots of 100-yards or more with some deal of consistency.