According to this article over at Slate.com, online wedding invitations are better than old fashioned paper/snail mail invitations AND they're better, and more efficient for handling RSVPs as well.

Yep, I'm talking online "e-vites" where your wedding invitations are sent by email and then your guests can RSVP by email as well.

What do you think - Tacky?  Or perfectly ok?

...it’s certainly true that there are many people who still believe online invitations are tacky and unbecoming of a high-class affair. The etiquette doyenne Peggy Post maintains that electronic wedding invitations “might fit the bill for an informal wedding,” but are “not the best match for a formal one.”

Personally, I think I like the idea - and WOW at the money you could save!