In my opinion, it's the latest, greatest, FREE ecard and party planning site out there.
They really do have all the tools necessary to plan a party, from start to finish. You can design your own invitation (and there are TONS of options to chose from) for free, send it out electronically for free, arrange for a pot luck list, a To-Do list, and a shopping list. It's easy to manage your guests, too. On-line, that is. There are applications for publishing on social networks and TONS of party ideas. ALL for FREE.
If parties aren't your thing, their ecard selection is pretty great, too.
Just thought I'd share......