I never used Imageshack, i figured out how to post my Citrus Tree Photos. I used the 320x240 for websites email, very large photos! You have a 150x112 (thumbnail) and 100x75 (avatar) which is the best to use posting Photos

On today's large screens a size of 320x200 is still quite small. I would suggest about 800 pixels on the longest side. I personally hate having to click an image to see a large size version...