Five Reasons to Use Flickr
Photopreneur offers 36 Reasons Flickr is a Photographer's Ultimate Tool.
You can do fun things on Animoto with your Flickr photos!
Wow! Amit Agarwal on his blog Digital Aspritations offers great tips and suggests assorted utilities to make Flickr sing. Well may not sing, but how to do such things as download pictures from Flickr to a DVD, other Flickr search tools including one that let you search by color, and other very cool stuff.
Natasha Wescoat brings an artist's perspective to making use of social media in her posts on Mashable, which is a great source (although a bit overwhelming!) for keeping up with latest social media news and tools along with how-tos and tips for using them.