There are several new improvements with Google’s online photo sharing site – Picasaweb. Features like new page layout design, "Name Tag", improved sharing, higher video quality playback and the most significant feature of all is the sign-in required album.

According to Google Photo Blog:

Today, we’re adding an even higher degree of control — the ability to share only with specific individuals. This is the most restrictive sharing setting, and it requires recipients to have (or sign up for) a Picasa Web Albums account. As such, it’s a bit more work than the well-balanced convenience of unlisted albums, but if you’re looking for exceptionally tight control over exactly who can see specific photo albums in your collection, give this feature a spin. (If you use Picasa software on your PC, we’ll be issuing an update in the next few weeks that will allow you to manage these new privacy options directly from your desktop.)

Checkout the newly improved Picasaweb.