Arts-E-cards
Cards with an arts & crafts theme.

Hallmark
Hallmark is always a great place to find cards for every occasion.

Blue Mountain
You have to pay for this service, but they have a 1 month free trial offer.

Care2
Greeting cards with an environmental theme.

Cloud Eight
This is a great site for e-cards, clipart and stationery for your email software ( but lots of pop-up ads).

DaySpring
A nice selection of inspirational greeting cards.

Dog Breeds
Special e-cards for dog lovers.

E-Greetings
Another paid e-card service, with a free month trial offer.

MoMA E-Card
Choose from a selection of art, paintings, photography and prints for e-cards and screensavers.

Sesame Street
From the Sesame Street postoffice.

Webshots
Webshots is one of my favourites. Nice cards and free screensavers.

Yahoo Greetings
With Yahoo you can send one of the cards from their selection or one of your own pictures.

Fun E-Cards
Beware! This site was not FUN!! The pop-ups were many and hard to get rid of.