Some of my favorite designs:

chris white's atlantic 48, the gunboat 34, the wharram 63, and a kurt hughes 36 (actually built out to 39, i've been on that boat several time and there are more detailed pictures of it here.

Here are some links to other multihull projects and boatbuilders, suppliers, and information. 

Pictures of Yves Parlier's new hydroplaning cat being launched have been posted to his website at http://www.parlier.org/ - this is a stepped planing hull design which looks a lot like seaplane floats. Parlier says this will open up the speed range of 40-60 knots for sailing catamarans. Whew!

http://www.fram.nl - Henny van Oortmarssen building an F-39 with resin infusion techniques
http://www.fram.nl/workshop/controlled_vacuum_infusion/album44/index.html - an amazing set of pictures of his resin infusion of an entire deck part.

http://catamaranco.com  - the catamaran company in fort lauderdale

http://www.boatbuilding.com -  the general boatbuilding community - monos and multis

http://home.houston.rr.com/pieceofwork - a kurt hughes 48' daycharter boat being constructed in houston- good links for vacuum and infusion supplies

Jeff Turner is doing a good job of gathering together information on Cross trimarans and his link is:
http://mysite.verizon.net/res78939/index.html

John Shuttleworth has a rather complete design page up for a 50' fast cat with lots of technical details. http://www.steamradio.com/JSYD/Dogstar50-article.html

and a big list of designers:

new zealand multihull photos - http://groups.msn.com/multihullsrule/shoebox.msnw

and a big bolger catamaran: http://thegreatsea.com