There are many sites for e-greetings, but the one that comes first to mind is the Leader of them all - BlueMountains.com. For all your occassions bluemountain is the way to go.
I find the site good for the following reasons -
The sheer variety for all occassions is overwhelming.
The site loads pretty fast.
It is internationally well known.
I have send innumerable cards to my relatives from this site and found the convenience great. There is no denying the fact that there are other sites with better graphics and animation, but in today’s fast paced life convenience is the rule of the day.
Try the Leader, you will not regret.