I came across this and was impressed with Access America. They normally do not cover terrorism but posted this on their web site today - probably because people were complaining:
All travel insurance policies, including those offered by Access America, have exclusions or situations for which benefits are not provided. In manycases these policies exclude losses arising directly or indirectly from terrorism. In other words, benefits are typically NOT payable for losses that result from terrorist incidents. However, the events of the past week have been far from typical.
As a special accommodation to our customers whose travel plans were directly affected by the terrorist incidents of September 11th, Access America will not apply the terrorism exclusion for this event. This special accomodation will apply to customers who purchased insurance before September 11 for trips departing before October 11, 2001. All other terms and conditions of the Certificate of Insurance will apply. As a result of this accommodation, Access America will honor claims for trip delay, vacation delay, travel accident, baggage loss and delay and trip cancellation and interruption that might otherwise not be payable due to the terrorism exclusion.