An online photo album is nothing new and Picasa has many features you can find on other graphic tools found on the cloud, I am sure. But here is something I really found convenient about Picasa, e-mail upload. Here is how they describe it:
You can now forward photos to your online albums using email. Perfect for use on your mobile device, you can even collaborate with friends by submitting photos to one album with the same email address.
I am really finding this convenient. Through Picasa, I set-up a Picasa web address, then I just send the graphics to it as an attachment. It then ends up in my Picasa drop-box. Real easy. So, now if the graphic is on the phone, I send it in an e-mail and it is there. Found it on any of my computers...e-mail...and its there. And if someone sends it to me as an e-mail, I can just forward it onto the drop-box. I can also send others the address and voila, they put graphics in Picasa for me.
FYI: If you use Picasa, you will find the e-mail upload listed under "New Features." It will walk you through setting up the e-mail drop-box.