The issue should be fixed in maverick now with that change:
libwnck (2.30.0-2) unstable; urgency=low
* Switch to 3.0 (quilt) format.
* 01_vertical_panel.patch: patch from Carey Underwood and Leniviy to
fix lockups when the window list applet is on a vertical panel.
Closes: #524117.
If the fix is confirmed to work it will be backported to lucid later
** Package changed: gnome-panel (Ubuntu) => libwnck (Ubuntu)
** Changed in: libwnck (Ubuntu)
Status: Triaged => Fix Released
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Gnome-panel freeze when 8 windows are open when the panel is
vertical/"non-expanded horizontal"
https://bugs.launchpad.net/bugs/187540
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