Here's a bunch of related sites either with more Etardia info, or just all-around good rave related sites that you should most definitely visit if you haven't already...

West-Coast Etardia Group Site
http://clubs.snap.com/etardia
To coordinate LA area mailings and group services.

Mid-West Etardia INFO Page
http://www.geocities.com/flashraves/Etardia/
Page with Chicago area Etardia event, and related, info.

Mid-West Etardia Group Site
http://www.egroups.com/group/etardians
To coordinate Chicago area mailings and group services.

Hyperreal
http://www.hyperreal.org/
A very large rave site w/ good event listings.

Ravelinks
http://www.ravelinks.com
Another very large rave site, w/lots of links...

ClubSoda.org
http://www.clubsoda.org
"Making the world a better place, one record at a time…"  The site of one of our favorite SoCal promoters, and home to Charlie Brown and Chelsea.