Geograph - photograph every grid square

You can use multi-submit as your submission procedure http://www.geograph.org.uk/submit-multi.php , which allows you to upload up to 20 images in one go by dragging them into tab A. You can upload multiple batches of images using this procedure. Once all your uploads are finished, switch to either of the two 'B' tabs, depending on whether you prefer the remaining three steps of the submission process (locate, describe, license) on separate pages (version 1) or on a single page per picture (version 2). In tab B, select one image at a time and complete the submission process as usual. You've got a week to fill in the details and license your images before they disappear from multi-submit.

Instead of switching each time, you can set your preferred submission method in your profile http://www.geograph.org.uk/profile.php?edit=1 .