Do Ecards Still Exist is a very general description of the state of ecards in the Facebook ages.
Are Electronic Greeting Cards A Bad Idea This old article by Leo Notenboom discusses the darker side of ecards - mostly the harvesting of your email address and those of your recipients. Nothing is free.
Greeting Card Fraud This 2024 article by AARP looks at how you may be fooled into clicking on a link for an ecard that is a scam.
Best Free Ecards This 2024 review by Lifewire gives short descriptions of ecard and virtual greeting card sites. These are free.
Regards - has a nice selection of pictures and has some multimedia cards. The site relies on Flash - just saying.
RiverSongs - has a large selection of completely free ecards including animation and music although I couldn't get the site to work the last time I tried???.
Ladydi Postcards - very HUGE list of links to e-cards. Their listings indicate if a site has music and/or animation. Hard to find anything useful due to the broken links and junk.
123 Greetings has e-cards. Mostly animated with sound.
- very HUGE list of links to e-cards. Their listings indicate if a site has music and/or animation. Hard to find anything useful due to the broken links and junk. 
has nice photos of DisneyWorld.