Novabuilder - An electronic postcard system that online marketers can use to add the power of viral marketing. - http://www.novabuilder.com/
Kangaroo Cards - A free hosted e-card resource for webmasters. Choose from a collection of public cards or create and upload original designs. - http://www.kangaroocards.net/
Electronic Greetings - Offers a template-driven solution for e-greetings. - http://www.electronic-greetings.com/
123 Greetings - Ecards affiliate program for webmasters. Service includes hosting the card pages, providing the programming and offers a custom content feature. - http://associates.123greetings.com/