Yahoo! sucks but I'm sticking with Flickr
I'm not happy about <a href="http://flickr.com/forums/help/32687/">Flickr forcing its "Old Skool" members to create and use a Yahoo! account to sign in to Flickr</a>, and I was very angry that <a href="http://flickr.com/forums/help/32752/">Yahoo! had (briefly) been using Flickr user's photos marked all-rights-reserved and CC non-commercial</a> for <a href="http://wii.yahoo.com">advertising the wii game machine</a>, BUT... Flickr is the best service of its kind out there, so I'm staying put.
For now. My pro membership expires in July 2008, and a lot can change in one and a half years...