Instructions
Add an email address to the Wii Address book. Do this by accessing the notebook icon in the lower right corner of the Wii home screen. After opening the icon, select "Address Book." Add the address.
Get online using a computer. Access the added email account. The Wii will have sent a verification email. Open the email and verify.
Return to the Wii. From the home screen, access the Photo Channel. Select a photo. Drag the cursor to the "Post" tab. Select to post to the added email address. The photo will be sent to that email's inbox.