Some new features has been added to Picasa Web Albums.

New Features:

1. Print ordering: Now, when you views photos in Picasa Web Albums, there’s an option to order prints directly from the site. The printing is currently offered from Shutterfly and PhotoWorks.
2. Video uploading: Until now, only paid users were allowed to upload videos. Now anyone can video upload for easy sharing, just like with photos—select them in Picasa and click the “Web Album” button.
3. Search tools:. Now you can search your photos in a certain gallery, and or your friends' public albums. Google indexes captions, tags, album titles, album descriptions, and album locations.
4. Tags: Picasa Web Albums lets you tag your photos. You'll find the option in the sidebar.

Google Blog

Picasa Web Albums Gets New Features