Easiest way would be to e-mail it to your Picasaweb account. Here's how to set this up:
- Sign in to your acount at http://picasaweb.com/
- Click the Settings icon in the top-right corner (it looks like a little jaggered wheel), then choose Photo Settings.
- In General tab in the 'Upload photos by email' section, check the box next to 'Allow me to upload photos by email'. Type in a "secret word", 6-15 characters long. As you enter this word, an email address appears.
- Click 'Save Changes' button at the bottom of the page.
Now that you have set up the email feature all you need to do is send your photo attachment to the unique email address as specified.