Picasa Web Albums one of the few Google apps that didn’t support encrypted connections has today been updated to now support them. You can login to the secure version at https://picasaweb.google.com.
Picasa Web Albums allows you to easily upload your photos to share with friends and family. More information about Google’s Picasa Web Albums can be found here.
Many Google services support HTTPS connections including: Gmail (enabled by default), Google Reader, Google Groups, Picasa Web Albums, Google Search, Google Finance, YouTube (partially encrypted).
Other services only support encrypted connections: Google Calendar, Google Docs, Google Sites, Google Health, Google Analytics, Google AdSense and AdWords, Google Web History, Google Bookmarks, Google Voice, Google Latitude, Google Checkout.