Web Albums for iPad - A Picasa Web Albums Photo Viewer 1.1
the author of this app says:
Web Albums App, the most popular Google Picasa Web Albums viewer for the iPhone, is now available on the iPad. Using your Google account and the apps easy setup and intuitive layout, you will be viewing, emailing, and showing slide shows of your favorite online Picasa pictures. Web Albums App takes advantage of iPad's stunning screen by displaying pictures at its full 1024x768 resolution. Your online pictures never looked so beautiful!
Requires iPhone OS 3.2 or later.