Continental Airlines is giving away 100 FREE OnePass miles with Promotion Code: TB3M28 or this link. These promotions come around quite often with Continental and you do not have to do anything more than register your Frequent Flyer OnePass number in order to get them (at least from my experience).

These offers are also a great way to extend your miles in case they are about to expire!

Use your Continental Airlines Credit or Debit Card to pay your monthly recurring phone and utility bills and earn miles — automatically — every month. Plus, earn 100 bonus miles when you register for this offer by April 30, 2011.