first of all what u asked has a spell mistake i guess..
its flickr.com and not flicker ... its a photo sharing website ...
they just rock... u can tag them , set high privacy depend on ur need... a web-2.0 site with cool features..
few best of them are camerafinder (http://www.flickr.com/cameras/)
mapview of geo tagged photos (http://www.flickr.com/map/)
explore option which gives u way to lot of possible ways of exploring flickr
http://www.flickr.com/explore/
hope you will enjoy the usage...
sorting photos by interestingness which just rocks... try it out