What is Flickr?
Flickr is almost certainly the best online photo management and sharing application in the world. Let us show you why!

Flickr is a way to get your photos to the people who matter to you. And since basic accounts are free, there's no reason not to explore further...
Upload

Upload from your desktop, send by email, or use your cameraphone.
Organize

Use collections, sets, and tags to organize your photos.
Share

Use groups and privacy controls to share your photos.
Maps

Share where your photos were taken, and see photos taken near you.
Make Stuff

Sexy cards, photo books, framed prints, Target pick up, DVDs, etc.
Keep in Touch

Get updates from family and friends.

I really like Flickr and it seems to keep getting better. There's way too much stuff on there, but lots to discover if you know how to search. There's plenty of tools and options.