While Adobe Reader 7.0.7 seems to be faster than 6.0 it still has this nasty little ad-display in the upper right corner of the window. This annoys me very much, but I found this tweak to turn it off.
Launch regedit.exe and navigate to "HKEY_LOCAL_MACHINE/SOFTWARE/Adobe/Acrobat Reader/7.0/FeatureLockdown". Create a new DWORD value named "bShowAdsAllow". The default value "0" is ok, it disables the ad-display.