1. Gradiants :  Blinksale
2. Big Fonts : Blogger
3. White Backgrounds : gmail , google
4. Wet Floor Effect : neondragon.net tutorial
5. Pixel Fonts : Collection of pixel fonts
6. Tag (Categorizing) : Flickr
7. Diagonal Backgrounds : StumbleUpon
8. Odd names and misplaced dots : del.icio.us

Ref : http://www.modernlifeisrubbish.co.uk/8-web-cliches-of-2006.asp