Tell them we don't need a Mac / Linux port. Trillian isn't great. I've used it several times and keep going back to Gaim. Gaim has a far better interface. It FEELS like it belongs running in the OS, Trillian (and other skinnable apps) don't.
Bush's site uses ASP. Kerry uses PHP.
ASP evidence: http://www.dangrover.com/blog/data/upimages/busher rorsmall.jpg
PHP: search through the source, you'll find a few.php links.