Smashing Magazine put together a really useful list of wordpress themes these themes are really something else take a look..

1. Vibrant WordPress Themes

PFO Stripes [ Demo ]

PFO Business [ Demo ]

FFF Lemon Twist (Demo and Download)

Several3 [ Demo ]

Adreu r2 [ Demo ]

Blogging Pro Theme [ Demo ]

DM-Bloodless [ Demo]

Illacrimo [ Demo ]

Elixir

Insense [ Demo ]

Zeke 1.0 [ Demo ]

jsTheme
Comes with a number of themes.

Smashing Theme [ Demo ]

DarkRed [ Demo ]

Gossip City [ Demo ]

Resurrection

Blue Steel

River Run

Yoghourt

Midsight Red & Brown [ Demo ]

Fluid Yellow Black

xPlosive Reloaded [ Demo ]

Red Stamp [ Demo ]

Dilectio [ Demo ]

Fauna

dfMarine [ Demo ]

Curved WordPress Theme [ Demo ]

Accord WordPress Theme [ Demo ]

2. Simple, Minimalistic Themes

iA

Modicus 0.2

Modern [ Demo ]

Documentation [ Demo ]

Jentri [ Demo ]

miniBits [ Demo ]

GIMP Style

Dayvan Theme [ Demo ]

Tree Theme [Demo ]

DePo Clean WordPress Theme [ Demo ]

BlueBird 1.0

Balance

Paisley [ Demo ]

Autumn

Brilliance [ Demo ]

Pixelate

Pockett [ Demo ]

Artuell [ Demo ]

Plane Jane

Briny

Elite

Blue Moon

3. Magazine Style WordPress Themes

WP Premium [ Demo ]

Modicus Remix

Morning After

Futurosity Magazine [ Demo ]

Structure WordPress Theme [ Demo ]

Visionary WordPress Theme [ Demo ]

WP Polaroid [ Demo ]

Overstand Theme

Jello Wala Mello WordPress Theme

4. Grid-Based WordPress Themes

Gridline Lite [ Demo ]

Refreshed: Grid Focus

5. Calm, Clean and Legible Themes

Sharpfolio

Coldblue

Cubismo [ Demo ]

Yomel [ Demo ]

Lust WordPress Theme

Abstractia [ Demo ]

HemingwayEx [ Demo ]

Blubbr

Ayumi [ Demo ]

Greenway 3C

K2-U3 [ Demo ]

OldLamp [ Demo ]

Prima [ Demo ]

ProSense

Insan [ Demo ]

Sakeena [ Demo ]

Margot

The Azure Hut

Livegreen [ Demo ]

Simpress [ Demo ]

Glued Ideas: Subtle [ Demo ]

Gluttony [ Demo ]

6. Advanced WordPress Themes

ExtJS WordPress Theme

Lounge2

Prebuilt

Neoclassical
A 3-column template system with rotating header images.

7. Experimental Themes

Bonsai, Red Growth Live
Big typography dominates.

Trevilian Way [ Demo ]

BrainTied 1.0 [ Demo ]
The front page displays only the list of recent posts.

Tropical Grunge [ Demo ]

Aspire

Isolated Theme [ Demo ]

Supermini

Fontella
The front page features only the main/recent post of the weblog.

ASCII Themes

Retro Mac OS X [ Demo ]

8. Photoblog & Videoblog Themes

Tumblelog For WordPress [ Demo ]

Nautilus

Nishita

pixel 100 Free Premium Wordpress Themes