yes something between 500-1000 words fits the bill.
UPDATE
I made some significant changes to the editorial
submission page, to make the process easier.
I was getting a lot of submissions are were not meeting the requirments I am looking for, so I added some more guidlines and more instructions on the submission page.
I also change the system to include a field to upload a picture, this picture is a small thumbnail that is used to draw attention to the article. It is displayed on the front-page and the editorials page.
Its pretty nifty, you don't need to spend time making a thumbnail in photoshop, you can upload any size JPG and the site will allow you to crop the image, by drawing a square box over the image, where you want the image to be cropped. This way the images are always the same size, and no extra photo editing work is required by the submitter.
I updated some of the past articles with this new feature, to see it in action look here:
http://www.canadaka.net/news
the images are also repeated on the article page itself.
I look forward to recieving more editorial submissions, any suggestions are welcome.