Just to add to Misha's link here's a couple of other ones!

• John Paul Caponigro
• Misha Gordin
• re: number of challenge entry limitations...Michelle, I have stood in awe of how you have managed to put together the challenge entries each month and display all the images submitted with such alacrity! I would think that some form of restraint is very reasonable! Either that or place them on the contest pages again (with no voting)...I do agree with Misha that posting and discussion of W.I.P's is a valuable part of the learning process. Whatever way you do it, you are doing a great job!