I love almost everything about Picasa, but there are some drawbacks:
A very cool thing that I discovered is that Picasa supports uploading to a number of different online photo services from Picasa itself. That is, you don’t have to download a bunch of different lame programs from each online photo place, Picasa will upload your Picasa photos with its own interface to their site. This seems to work well for Kodak EasyShare at least. When you have pictures in your Picture Tray, just select “Order Prints” and you can upload stuff to the online photo site of your choice. It’s nice.