Here is some web design gallery links such as cssbeauty, cssimportant, darkeye, lightondark, css gallery, cssremix, cssreboot, cssdrivecssheaven, csscollection, webdesignbook and so on. It is useful for you to think about ajax, xhtml, css and color sheme.
If you want to suggest your showcase, let me know through rhythmcollision(at)gmail.com or below contact form.
Anjo Dekiteharu
http://anjo.dekiteharu.jp/
Best Web Design
http://www.bestwebgallery.com/
CSSGALAXY
http://www.cssimport.com/
CSSREMIX
http://www.cssremix.com/
CSSDRIVE
http://www.cssdrive.com/
CSSREBOOT
http://www.cssreboot.com/
CSSELITE
http://www.csselite.com/
CSSBEAUTY
http://www.cssbeauty.com/
CSSHEAVEN
http://www.cssheaven.com/
STYLEGALA
http://www.stylegala.com/
LIGHT ON DARK
http://www.lightondark.com/
Thesis
http://thesis.veracon.net/
Styleboost
http://styleboost.com/
CSSMANIA
http://cssmania.com/
CSSVAULT
http://cssvault.com/
CSSBloom
http://cssbloom.com/
CSS-DEMO
http://css-demo.com/
DarkEye
http://www.dark-i.com/
WEBCREAM
http://www.webcreme.com/
Plasticpilots
http://www.plasticpilots.com/
Lovelyblogs
http://www.lovelyblogs.com/
Inspirationking
http://www.inspirationking.com/all-entries
Most inspired
http://www.mostinspired.com/
ProWebArt
http://www.prowebart.net/
Refresh
http://www.refreshlinks.org.uk/index.php
Screenspire
http://screenspire.com/
Webdesignbook
http://www.webdesignbook.com/
Designsnack
http://designsnack.com
designbeauty 
2006/10/19 at 6:05 am
Have you ever tried http://designsnack.com ?
2006/10/20 at 3:42 pm
Thank you!
I add designsnack.
2007/09/18 at 10:34 am
Also, http://www.designexpanse is a great gallery, Did you try this yet?
2008/01/04 at 4:43 pm
CSS based Church Websites directory
2008/01/04 at 4:44 pm
Pakistan Website Design and Developments. http://www.appspakistan.com
2008/11/18 at 5:21 am
http://www.rjvisuals.com
It’s Ritesh Jain’s Personal Design Portfolio. I am Creative Interactive Media Designer from India.