Having the Facebook Button for Picasa makes uploading a one step process. Well, one step if you use Internet Explorer. If you’re scared of the security, or lack thereof, in IE (like me) and use Firefox or Chrome you’ll have to enter your password each time.
Hint: To avoid having to approve your uploaded photos each time, just click the Enable Extended Access link at the bottom of the screen where you choose what album to put them in. From that point forword you’ll no longer have to log in to Facebook and approve the photos.