Invitations

Anyvite
Free webapp that allows users to create invitations and invite friends to events. Includes RSVP facility.
http://anyvite.com/

Evite.com
Offers event planning and invites. Features tracking, maps and reminders.
http://www.evite.com

Invite-o-Matic.com
Offers customizable designs for parties, baby showers, dates. movies and coffee.
http://www.invite-o-matic.com

Mother's Bliss
Membership birth announcement service.
http://www.mothersbliss.co.uk/Birth_Announcement/enterbirth_announcement.asp

SendAnInvite
Provides announcement, invitation and event management services. Features include RSVP management, maps, tracking, reminders, and event calendars.
http://www.sendaninvite.com/