Adobe has classified the recent vulnerability as a critical issue and are recommending that the Acrobat reader be upgraded to version 8 or as a minimum the affected dll is replaced. 

To quote them directly they are saying "Adobe categorizes this as a critical issue and recommends affected users uninstall any affected software."

Their advisory can be found here

You may need to take steps to test and patch/upgrade your end user systems.

Thanks Matt for the pointer.

Mark
ISC Handler on Duty
Shearwater