If you took my earlier advice and upgraded to Picasa 3.9 you may have noticed that it links to Google+ Photos not Picasa Web Albums. The actual photos are in the same place this is just a different view. However that view does have a few differences and omission. You can always (well at the moment) get back to the traditional Picasa Web view easily using this link.
Google do have a summary sheet noting the changes to Picasa Web Albums once you join Google+.
One special condition worth noting is that much of your web album may suddenly be FREE not counted in your 1024MB storage limit. Once you sign up for Google+ any photo less than 2048 pixels and any video less than 15 minutes does not count against your limit. I dropped from 24% used to 2.68% used!
Three of changes worth noting, that are not mentioned in the google list above, but which may be very important to many existing users are -
- You can not share with your friends or family just using an email invite alone. You can still send an invitation email to view your photo BUT unless the recipient has a google account they will not be able to view the photo. This effectively means Picasa Web Albums is no longer suitable for private family albums unless the whole family join google+ or get a google account. I EXPECT THIS WILL BE A DEAL BREAKER FOR A LOT OF PEOPLE. If you have family members worried about privacy, don’t upgrade to Picasa 3.9 and perhaps stop posting family to picasa web.
- The Picasa Web Album view still lets you set your creative commons licencing (albeit under allow reuse item). Whereas there is no mention of licencing in google+ photo. Does this mean google is abandoning creative commons? I EXPECT THIS WILL BE ANOTHER DEAL BREAKER FOR CREATIVE PEOPLE.
- The picasa web view shows how many times a photo is viewed. The google+ photo view just show the number of +1s and comments.