I post photographs on a few websites besides just my blog and website. Here's a list of where you can find me.
My website is for my portfolio. I tend to keep each gallery limited to 25 or less of the photographs that I think are the best in that category. These photographs are available to purchase as prints either signed or unsigned. There is also a link to my stock photographs which is more inclusive.
Usually, I use my blog to comment on some projects I'm currently working on. Sometimes like now I might post links that people might find interesting or useful.
Flickr is an online photography community. You can post pictures, get feedback, and critiques. You can also join photo communities with like-minded photographers. I use flickr to post whatever I'm currently working on.
Red Bubble is a place where Artists(photographers, painters, etc) can post their work and sell their work. Their head-quarters are in Australia, and they have some nice products. There is also a nice community. I have more photographs for sale at Red Bubble then I do in my portfolio, but I do limit it to work that I consider suitable for wall art.
I don't post a lot at NatureScapes but I do keep track of what is going on. It's a great place to learn about nature photography. You can also post images for critique in their forums.