I love Flickr endlessly. In fact, I had paid for another two years of Flickr pro account at USD49.95 and my Flickr pro account membership ends in 2010.
One of the feature I like Flickr is the 'Blog This' whereby I can just click on any photos I have in my Flickr album and start writing from Flickr. It is such breeze because I can blog to several blogs just by signing into Flickr. It works on many types of blogs including Blogger blogspot.