I worry about my hard drive crashing and losing all of my images. (For the sake of discussion, lets forget about backing up images on a DVD.) I could be wrong (and set me straight if I am) but I tend to think that Picasa and Flickr are the two best places to save, back up and store your images. They are probrably the two best image hosts least likely to declare bankruptcy or close down their web site. It'll probrably be hard to find someone who has a lot of experience with both image hosts, but if you are that rare person who has used both extensively, which one do you prefer and why?