Depending on your route, Amtrak Guest rewards can be a good deal. Its only 1000 points for one way on "special routes." A special route includes the following:
Cascades: Vancouver, BC - Seattle - Tacoma - Portland - Salem - Eugene
Pacific Surfliner: Paso Robles - San Luis Obispo - Santa Barbara - Los Angeles - San Diego
Capitol Corridor:Auburn - Sacramento - Emeryville (San Francisco) - Oakland - San Jose
San Joaquins: San Francisco Bay Area/Sacramento - Bakersfield/Southern California
Hiawatha: Milwaukee - Chicago
Downeaster: Portland, ME - Boston
The Missouri Service (daily service between Chicago and Kansas City, MO)
The Illinois Zephyr (daily service between Chicago and Quincy, IL)
Illini Service (daily service between Chicago and Carbondale, IL)
The Saluki (daily service between Chicago and Carbondale, IL)
The Carl Sandburg (daily service between Chicago and Quincy, IL)
The Lincoln Service (daily service between Chicago and St. Louis, MO)
The Kansas City Mule and St. Louis Mule travel daily between St. Louis and Kansas City, MO.
The Hoosier State runs daily between Chicago and Indianapolis with Reserved Coach service.
The Heartland Flyer offers daily service between Oklahoma City and Fort Worth.
The Pere Marquette: Daily service between Grand Rapids and Chicago.
The Piedmont makes daily trips between Raleigh and Charlotte.
You can transfer points from Continetal Airlines and Starwood Preferred Guest to AGR or buy points directly from AGR at $13.75 for 500.
AGR points can also be a good deal on long ditance travel in sleepers or roomettes. -- Suzanne