I used Evite to organize the RSVPs for my most recent party, and found it to be remarkably useful, in that it led to a larger than expected turnout, with more people bringing food and/or beverages to share than would ordinarily have happened. It was arguably more useful for the guests themselves too, in that it let people know some of the others who would be attending, and gave them more information for planning carpools, etc. It also makes planning the next event we have a *LOT* easier.
But the issue that concerned me most with Evite is that I heard in the process of planning the event that Evite spams its users and sells their email addressses to 3rd parties. Not good at all!
I emailed the people over at Evite with some specific questions on how they handle such issues, however, and what they had to say was very positive.
In other words, each registered user will have the opportunity to tell us they do not want to receive information from a third party, prior to ever receiving any communications from that third party.
In addition, a registered user can manage their Evite account through the
"My Evite" tab on the Evite web site."
And sure enough, if you go to Evite and click the "My Evite" tab and the "My Account" link, you will see a box that says "Yes, I'd like to receive Evite news and special offers." Unclick that and you will not receive any information from 3rd parties, or even from Evite itself. (This option is visible when you register with Evite, so it is quite likely you already have this option unchecked.)
Besides, with about 2/3rds of all email last month being spam, it doesn't sound like those people really need any additional help to irritate us.