Web Services

Most of these services are free to get started, some have premium services or fees associated with selling product.

Art Communities:
Deviant Art
Etsy
Saatchi

Blogs:
Blogger
Typepad
Word Press

Photo:
Flickr
Photo Bucket
Photo.net
Photo Shelter
Picasa
Shutterfly
Snapfish

Zenfolio
Social Networking:
Facebook
My Space
Twitter