I'm a huge fan of anything that can displace Evite, but when organizing events, I found I consistently fall back to Evite. Anyvite adds nice-to-haves like RSS, mobile support, and a much cleaner/streamlined UI, but none of these are MUST-haves. If I use anything but Evite I risk people not recognizing the email as an invitation and deleting it. Plus, I have to put up with all the "Why didn't you just use Evite?" jokes. As cool as AnyVite (and Renkoo and Socializer and mypunchbowl and Google Calendar) is, I'd rather spend the extra 10 minutes muddling through Evite. I guess that's sad.