Nice plugin. However the way jQuery is being jammed into the code is really not cool at all and causing conflicts with plugins that use the method of enqueing jQuery that WordPress recommends.
Specifically rsvp_frontend.inc.php at line 290:
$form = "<script type=\"text/javascript\" language=\"javascript\" src=\"".get_option("siteurl")."/wp-content/plugins/rsvp/jquery.js\"></script>\r\n";
Looking forward to the next release!
