You could transfer 5000 of your CO points to Amtrak and then onto UA with no devaluation and solve your CO and UA problems in one swoop. (Actually, you could presumably go CO --> Amtrak --> CO with no loss and solve your CO problem.)

You could take a survey at www.opinionplace.com to solve your American Airlines expiration problem.

You could also transfer points into one of the programs out of a hotel frequent guest program.

With Northwest you can also redeem some miles directly for magazines. Similarly, a milepoint.com magazine redemption would work for any of your programs that participate.

Presumably a small points.com transfer into one and out of another account works too.

iDine has already been mentioned as a good tool. Credit card signups work.

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View from the Wing: A blog about Free Miles and Free Markets