Amtrak’s new small business program allows you to earn points in addition to the standard Guest Rewards program both for your travel and those that enter your small business program membership number.
Accounts in this program earn 25% of the base points earned on Amtrak by each traveler.
Through December 31, 2007 enrollment code STR07 yields a 1500 point signup bonus.
(I got a copy of the offer and ignored it, so thanks to Samit for beating me over the head with it…)