Here is a list of websites offering electronic greetings. There are wide variety of ecards available. Many include sound and animations or videos. Some are also customizable. Some ecards, like those from JibJab, let you upload your own face or the face of a friend.

123greetings

AmericanGreetings.com

Blue Mountain Arts

Care2

CrossCards

DaySpring

E-Cards

Egreetings.com

Hallmark eCards

JibJab

MoMA ecards

Ojolie

Open Me

Pingg

Punchblowl

Someecards


Ecard Scams

Electronic greeting cards can be great fun but because they are sent by email they can be used to trick people into downloading malware. Here are few articles that will inform you what types of misleading ecard emails you should watch out for.

• Scambusters E-card Safety - Find out the signs of a fake ecard
  
  
• Online E-cards Gotcha Greetings - Delete the e-card if you see one of these red flags
  
  
• IdentityForce: Ecard Safety - They note that one sign of an email scam is an attachment.