For years I used Sony's Imagestation to store my photos online and they met my needs. You couldn't really beat free unlimited storage. That's probably why they closed up shop. After they went out of business I had my pictures automatically transferred to Shutterfly, but I don't really care for that service. I have taken many pictures since joining that site, but haven't uploaded any of them. I've been investigating my options and have narrowed it down to Flickr and Picasa.
Right now I am leaning towards Flickr, mainly because it seems more "fun," for lack of a better term. The community aspect and some of the bells and whistles appeal to me. But then, Picasa seems like it will seamlessly integrate with all things Google, which is also plus. Neither service offers free unlimited storage so it looks like I'll have to go the premium route no matter what I choose. I had at least a gigabyte of pics on Imagestation and I plan on re-uploading all of them over time.
What do y'all use? What are the pros and cons of each of these sites? Is there some viable third option that I've completely overlooked?