Emmanuel,
Thanks for posting nice hot topic..
One of the largest company, took precatutions almost 18months back. As I understand from few key people in that organization, the Sr. Management have defined few stratagies based on the financial analysts inputs.
Following few things which I have got to know..
- Reduced on International Travel
- Stopped hiring and replacing (only exception cases are considered).
- cost reduction operations
- Most of the events cost is reduced
By doing the above, the company didn't lay-off any as of now.
I feel, companies should have good market & financial analysts to work such concerns.
If it's a sudden disaster than Ambal's point 1 is more effective and then cutting avg. performing workforce. As employees salary cost to the company is 60 to 70%, all eyes will on that...

..
I can really feel the tought time for HR Managers/Heads and respective supervisors to boost the moral of employees..
Hope good times'll come soon...
KK