I do love Riya, but Picasa has been my application of choice to organize my thousands of digital photos on my home computer. I've always wished I could see those photos from the web, either from my office, or to share with remote family.
Google finally "webalized" Picasa. It's about time. They only offer 250 megs of storage free with an option to upgrade to 6 gigs for $25/yr, and the application is still in limited, invitation only, testing. Philipp Lenssen notes that there is no such thing as a private album, just public and "unlisted". Album titles are appended to the URL of a user's "homepage" so others can merely guess at album titles such as "untitledalbum" and discover your hidden albums. Keep that in mind when uploading photos.
Aside from the privacy implications, it is a very welcome addition to the Google portfolio. link to Picasa Web