Nikon has the details of it’s 31st Annual International Photo Contest.
Looks like they are giving away quite a bit of equipment as prizes and no where does it say that the images submitted needs to be created with a Nikon product. So it looks like we are all in this together if you want to submit an entry.
Entrant criteria
The Nikon Photo Contest International is open to all photographers, professional or amateur, from any part of the world.
Theme and categories
Theme “At the heart of the image”
Categories
(A) Free subject
(B) Smile, Smile, Smile!
Please note that the same photograph may not be submitted to both categories.
Entry period
Entries are accepted from 1st September to 30th November, 2006. Entries sent by conventional mail should be received either on or before 30th November, 2006. Entries sent via the Internet will be accepted until 24:00, 30th November, 2006, Japan time. See below for further details regarding entry via conventional mail and the Internet.

Canon and Olympus users: strip your EXIF data by using “save for web” if you hope to stad a chance