Heard lot of compliants about this strange case. The cursor seems to jump to different location on the screen while typing in OpenOffice on Ubuntu Linux laptops. I haven't faced this problem before. Perhaps checking 'Disable touchpad while typing' Touchpad setting in Mouse Preferences would fix this issue.
You can also use the following command to enable this setting from commandline.
gconftool --toggle /desktop/gnome/peripherals/touchpad/disable_while_typing