(Registered users may preview this theme)
Reflection theme for Wordpress. Reflection is another web2.0 style theme, with dark colors and a reflection on the header image (that alone would is enough to make something web2.0!). This theme is widget ready.
Theme creator: Themey
Theme sponsor: wordpress web hosting
License: Creative Commons. Attribution links in the footer must stay.
Update: This theme has been ported to coppermine.
(Registered users may preview this theme)
Note theme for Wordpress. Note theme is reminiscent of a notice board or jotter. A psd is included to modify the header image to suit your site. Note theme is widget enabled.
Theme creator: Themey
Theme sponsor: ADHD
License: Creative Commons. Links to Themey.com and to the theme sponsor in the footer must stay.
(Registered users may preview this theme)
Green Wave theme for Wordpress. Green Wave is a fresh modern theme, dare we say web2.0? In dark green with highlights Green Wave will suit only cool blogs 
Green Wave is ready to be used with Wordpress Widgets. This is one of my favorite themes, I think I might buy it for my own blog
Update: The guys from MaiaHost have sponsored this theme. Thanks guys
Theme creator: Themey
Theme sponsor: WordPress Web Hosting
(Registered users may preview this theme)
Arctic theme for Wordpress. Arctic is a theme for Wordpress using cold colours and a leafless tree to present a bleak picture until the user scrolls down to see the burning colors of a cars headlights.
Theme creator: Themey
Theme sponsor: Aviva Web Directory
License: Creative Commons. Attribution links in the footer must stay.