Picasa Web Albums are used to store your photos online. If you want to upload pics ,you have to either install Picasa or should visit your Picasa Web Album account. If you don’t want to do either of them you can easily upload photos to your Picasa Web Albums by Email i.e., send your photos by email to a secret address which will get stored in you album..
To do this, First you need visit the Settings page of Picasa web albums account and check "Allow me to upload photos by email." The secret email address where you can send your photos has the following format: username.secretkey@picasaweb.com, where secret key needs to be defined in the settings. .
By default, Picasa Web uploads your photos to the built-in Drop Box albums, but it’s a good idea to choose your destination by entering the name of an existing album in the subject of your email. You can send the photos just like any other ordinary mail by just uploading them as attachments and sending them to your secret email address.
Also make sure you don’t share the secret email address with other people. And if you do, just choose a different secret key for your address to maintain privacy and to prevent others from using your album.
You can attach up to 20MB of photos in JPG, GIF and PNG formats, which is a pretty reasonable limitation. Since Picasa Web’s mobile site still doesn’t support uploading photos, the new option should be really useful when you want to share photos from a phone with email or MMS capabilities. Try it and you will love it.