Yes, I'm probably one of the late-bloomr in the flickr craze, but I recently found out that Yahoo! is EOL-ing its photo service. When you go to http://photos.yahoo.com, it will ask you to move your photos to a different service. Since flickr is now owned by Yahoo, they have a special deal (which they don't advertise until AFTER you pick flickr) that will give you 3 months free of the pro account. With a pro account, you will have unlimited upload capability. I've been uploading my old pictures like crazy. This also make me realize that I take WAAY too many pictures. It made me take less pictures on my next outing.
The interface is nice and you feel accomplished when you've uploaded a set of pictures. :) Still a long way to go for me, but at least I have a place to show my pictures instead of the dusty DVDs they're in right now....