I really like the new CS4 too. I had to upgrade my computer though, since I was on an older single core AMD machine and CS4 was just too much for it to handle (not to mention Lightroom).
The new machine just flies though! It's an Intel Q9550 Quad Core running at 3.4Ghz, 8GB of RAM, ATI Radeon 4850 HD 512MB Video Card, Velociraptor hard drive for OS and programs, with 2 separate additional disks for scratch and images, running on Vista 64bit. Total cost was about $1300 to build it myself.
It runs the Retouch Artists Photoshop Speed Test (http://www.retouchartists.com/pages/speedtest.html) in just 18 seconds, and the video card GPU does screen redraws very fast.
I suppose the new machine has colored my view of CS4 when compared to CS3 on my old box, but regardless I'm very happy with the upgrade.
I tired downloading that file and got errors in the zip when unzipping. Do you have a working copy of that zip? I also emailed them about it with the errors, which are below:
! E:\TEMP\retouchartists.com_speed_test.zip: Cannot create Retouch Artists Speed Test\Action\Icon
! The filename, directory name, or volume label syntax is incorrect.
! E:\TEMP\retouchartists.com_speed_test.zip: Attempting to correct the invalid file name
! E:\TEMP\retouchartists.com_speed_test.zip: Renaming Retouch Artists Speed Test\Action\Icon
to Retouch Artists Speed Test\Action\Icon_
! E:\TEMP\retouchartists.com_speed_test.zip: Cannot create __MACOSX\Retouch Artists Speed Test\Action\._Icon
! The filename, directory name, or volume label syntax is incorrect.
! E:\TEMP\retouchartists.com_speed_test.zip: Attempting to correct the invalid file name
! E:\TEMP\retouchartists.com_speed_test.zip: Renaming __MACOSX\Retouch Artists Speed Test\Action\._Icon
to __MACOSX\Retouch Artists Speed Test\Action\._Icon_
! E:\TEMP\retouchartists.com_speed_test.zip: Cannot create Retouch Artists Speed Test\Icon
! The filename, directory name, or volume label syntax is incorrect.
! E:\TEMP\retouchartists.com_speed_test.zip: Attempting to correct the invalid file name
! E:\TEMP\retouchartists.com_speed_test.zip: Renaming Retouch Artists Speed Test\Icon
to Retouch Artists Speed Test\Icon_
! E:\TEMP\retouchartists.com_speed_test.zip: Cannot create __MACOSX\Retouch Artists Speed Test\._Icon
! The filename, directory name, or volume label syntax is incorrect.
! E:\TEMP\retouchartists.com_speed_test.zip: Attempting to correct the invalid file name
! E:\TEMP\retouchartists.com_speed_test.zip: Renaming __MACOSX\Retouch Artists Speed Test\._Icon
to __MACOSX\Retouch Artists Speed Test\._Icon_
! E:\TEMP\retouchartists.com_speed_test.zip: Cannot create Retouch Artists Speed Test\Test Image\Icon
! The filename, directory name, or volume label syntax is incorrect.
! E:\TEMP\retouchartists.com_speed_test.zip: Attempting to correct the invalid file name
! E:\TEMP\retouchartists.com_speed_test.zip: Renaming Retouch Artists Speed Test\Test Image\Icon
to Retouch Artists Speed Test\Test Image\Icon_
! E:\TEMP\retouchartists.com_speed_test.zip: Cannot create __MACOSX\Retouch Artists Speed Test\Test Image\._Icon
! The filename, directory name, or volume label syntax is incorrect.
! E:\TEMP\retouchartists.com_speed_test.zip: Attempting to correct the invalid file name
! E:\TEMP\retouchartists.com_speed_test.zip: Renaming __MACOSX\Retouch Artists Speed Test\Test Image\._Icon
to __MACOSX\Retouch Artists Speed Test\Test Image\._Icon_