I experienced the problem when I had two monitors active: With the
Windows key held down, each click of the mouse wheel rotated "upwards"
(to zoom in) causes a seemingly random jump of the cursor about two
inches to the left, right or down.

After disabling the external monitor the problem does not occur.

After re-enabling the external monitor the problem re-occurs.

Switching Appearance Preferences | Visual Effects from Extra to Normal
does *not* fix the problem.

The workaround described above *does* fix the problem.  Specifically, in 10.04 
LTS (Lucid Lynx), I do:
$ sudo aptitude install compizconfig-settings-manager
$ ccsm
In the CompizConfig Settings Manager window, click the Enhanced Zoom Desktop 
icon.
Click on the Mouse Behaviour tab.
De-select Sync Mouse.


** Attachment added: "My X log file"
   http://launchpadlibrarian.net/52257967/Xorg.0.log

-- 
cursor centers on desktop when zooming
https://bugs.launchpad.net/bugs/154719
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