Hey, it must be the beginning of the month for we have another Opposed Roll Parry System! (Joking, but your suspicion is correct, this does seem to come up once every two months). Previous attempts:
Skjaldbakka's Parrying System
Talanic & Erk's Interception System
Tough Tonka's D20 Parrying System
Elliott20's Parrying System
Magic8Ball's Parrying Feats
Munchy's Parrying Fighter Feats
Senir's Parry Skill
Matthew's Active Defence
...and those are just the ones I know of. Anyway, do consider giving some of these a read, as they are full of helpful information and advice.
For the record, I have never seen this in a Wizards Book, with one exception. The Wall of Blades Manoeuvre from Tome of Battle. This was around in 2e, though