Angelstar Creations

Wicked Moon - Alternative to cute e-card sites, free e-cards and greeting cards featuring beautiful fantasy art. Birthday cards, holidays, love, friendship. E-cards are free with fun or atmospheric music. No membership required.
Also Flash e-cards, funny pictures, friendly forum.
http://wickedmoon.com/

Jacquie Lawson
JacquieLawson.com animated e-cards collection - the classiest e-cards on the web! All Jacquie's cards use Macromedia Flash. You must become a member and pay a small yearly fee to send completed e-cards.
http://www.jacquielawson.com/

  AngelWinks Heavenly Post Card Shop.   http://angelwinks.net/PostCardPageIndex.html
  No Membership Required.

http://www.regards.com/
The web's largest collection of free greeting cards including free birthday ecards, animated e-cards, and free holiday ecards. Personalize your free greeting cards and free ecards. Use FREE on-line e-card site-builder system.

http://www.americangreetings.com/
Requires membership

http://www.bluemountain.com/
Blue Mountain offers free ecards and print greeting cards for birthdays and other holidays and occasions. Choose from animated cards, musical ecards, printables and more. Free Trial Membership, but must pay to send cards after that.

Online greetings and gifts with global, educational and environmental twist!
http://www.e-cards.com/

These were some pages I found. Please suggest any good sites you come across so I can add more.