Acegreetings.com
[ http://www.acegreetings.com/ ]
Offers interactive flash based email cards that can be sent for a variety of occasions including holidays and birthdays.
Birthday Alarm
[ http://www.birthdayalarm.com/ ]
Features greeting cards for all occasions.
EZezine
[ http://www.ezezine.com/ ]
Prides itself on catering to e-zine content publishers, not to email marketers.
Play By Electron Games
[ http://www.pbegames.com/ ]
Provides information on play be email games such as Eldritch, Iron Kings, and Monsters.