Scutage

From today's Guardian: Many pledges but few new troops for Afghanistan:

Gordon Brown won agreement for a trust fund scheme by which nations could support the war effort with money or equipment. The prime minister argued that the plan would increase the resources available to Nato commanders in Afghanistan. He said Britain would contribute £5m to an initial fund to provide helicopters, in short supply in Afghanistan, and said eight other unnamed countries had put money in.

The list was thought to include Australia, Austria, Luxembourg and Norway.

From Infoplease:

Scutage: feudal payment, usually in cash, given in lieu of actual military service due from a vassal to an overlord.

Still, at least it makes these countries' relationship with the US crystal clear.