Share your pictures and slideshows:
http://www.imageshack.us
http://www.freeimagehosting.net/
http://www.slideshare.net/
http://www.zeocast.com/z7/index.asp  (various backgrounds & music to add to your pics)
http://www.flickr.com/
http://www.vmix.com (various backgrounds with FULL songs for your slideshows)

Share your pictures and videos –

(Some allow you to create your own channels, and or blogs):
http://www.broadcaster.com (also allows .flv file uploads)
http://www.pickle.com
http://www.vimeo.com/
http://www.vmix.com
http:/www.veoh.com
http://www.dailymotion.com  (20 min max 150 megs, and other cool things)
http://www.mywaves.com
http://grouper.com/
http://www.jumpcut.com/
http://video.yahoo.com/
http://videos.ning.com/
http://www.muveemix.com/
http://www.vsocial.com/

http://www.viddler.com/
Read a review on Viddler:
http://www.solutionwatch.com/539/viddler-enhance-your-videos-with-timed-tagging/

http://www.motiono.com/
http://blip.tv/
http://www.zippyvideos.com/
http://www.putfile.com  (also allows .swf file uploads)
http://www.livevideo.com/
http://one.revver.com/revver
http://www.vlip.com/
http://www.helloworld.com/

Fun to watch video sites:
http://www.break.com/  (formerly big-boys.com )
http://www.jibjab.com/
http://www.brightcove.com/
http://stage6.divx.com/
http://www.vuze.com/app
http://video.msn.com/v/us/v.htm

http://www.atomfilms.com/

Blog sites (other than Myspace, Hi5, and Facebook) :
http://www.friendster.com/
http://www.xanga.com/
http://multiply.com/
https://www.blogger.com/start

(Note: as I find more, I will add to this list.)