http://kegel.com/wine/yagmarkdata now has data from five different benchmarks:
3dmark{2000, 2001, 06} and heaven2_{opengl, d3d9}, and running on a semi-whimpy
e8400 dual core box with an nvidia gt 220 card, on both Vista and Ubuntu+Wine.

First, the good news:
the OpenGL version of the Heaven benchmark achieved 99%
of the expected framerate on Wine, not bad, and it looks good, too.
The 3dmark* demos look good in general.

And now the bad news:
in general, Wine's D3D version achieves only half to three-quarters the performance
of Vista's.
The Heaven D3D benchmark doesn't look right in quite a few ways (and
one regression is very recent), requires more video
ram than on Windows, and hangs at the end.
3dmark2001 has a strange water problem in the nature test at 30 seconds.
3dmark06 lacks shadows in the firefly forest.
Related bugs:

Yagmark is now in fairly good shape, please try it yourself; see http://wiki.winehq.org/yagmark

The file http://kegel.com/wine/yagmarkdata/vista-vs-wine-1.1.44-19.txt
shows how wine does vs. vista.  Here's an excerpt (values given are
medians from six to ten runs):

From: dank@kegel.com; CPU: E8400; GPU: GT220
benchmark_variable                   Vista          wine-1.1.44-19 ratio
3dmark06_3DMark_Score                4868.00        3385.00        0.70
3dmark06_CPU1_Red_Valley             0.86           0.86           0.99
3dmark06_CPU_Score                   2740.00        2705.00        0.99
3dmark06_GT1_Return_To_Proxycon      17.43          13.28          0.76
3dmark06_GT2_Firefly_Forest          14.35          10.64          0.74
3dmark06_HDR1_Canyon_Flight          16.80          9.73           0.58
3dmark06_HDR2_Deep_Freeze            19.19          11.35          0.59
3dmark06_HDR_SM3_0_Score             1800.00        1053.00        0.58
3dmark06_SM2_0_Score                 1906.00        1433.00        0.75
3dmark2000_3DMark_Result             30262.00       17197.00       0.57
3dmark2000_CPU_Speed                 1227.00        1082.00        0.88
3dmark2000_Game_1_Helicopter_High    283.60         151.60         0.53
3dmark2000_Game_2_Adventure_High     215.10         142.20         0.66
3dmark2001_3DMark_Score              28289.00       15634.00       0.55
3dmark2001_Game_1_Car_Chase_High     78.80          38.20          0.48
3dmark2001_Game_2_Dragothic_High     321.30         159.10         0.50
3dmark2001_Game_3_Lobby_High         231.10         109.60         0.47
3dmark2001_Game_4_Nature             114.00         106.70         0.94
heaven2_d3d9_FPS                     18.38          9.30           0.51
heaven2_d3d9_Min_FPS                 9.73           5.74           0.59
heaven2_d3d9_Scores                  462.92         234.37         0.51
heaven2_gl_FPS                       16.20          16.12          0.99
heaven2_gl_Min_FPS                   10.16          9.33           0.92
heaven2_gl_Scores                    408.19         406.08         0.99

- Dan