Citibank announced changes last month to its ThankYou rewards network. Changes including increasing the number of points required to redeem certain rewards and the addition of stipulations that they can suspend or cancel rewards points if your credit card is not current or you do not make a purchase within a certain time frame.

Another big credit card rewards change is for the Chase Freedom credit card. Cardholders used to earn one point for every dollar charged and three points for every dollar charged in the cardholders top three spending categories. Now rewards on the Chase Freedom card have been reduced to one point for every dollar spent. Fortunately for existing Chase Freedom cardholders, this change will only apply to new customers who sign up for the card.

Will your credit card rewards change? Watch your mail to find out.

For example, Wells Fargo has a program called the “Wells Fargo Debt Pay Down Solution” in which the rewards on a Wells Fargo credit card can be automatically applied to the balance or other loan balances at the bank.

Fidelity Investments also introduced the Retirement Rewards Card, a credit card that pays rewards of 2% of all purchases and automatically deposits the rebates into a Fidelity IRA.

Although not new, Discover Card also offers a credit card aimed at customers carrying a balance that will help them get out of debt—the Discover Motiva Card features cash back and a unique perk: For every six months on-time payments, Discover will waive one month of finance charges.

Discover Cards have an exciting promotion for all card members—new and existing: Receive a $20 gift card for every $200 you spend at participating malls and stores between Nov. 1, 2008 and January 4, 2009. You can earn $100 in gift cards by spending $1,000 on your Discover Card on your holiday shopping.

Plus, if you apply now for a Discover More Card—you’ll also earn a $50 cash back bonus after your first $500 in charges within three months.

Finally, you’ll still be eligible for at least 1% cash back on all of your purchases. So if you apply for a new Discover More Card and spend $1,000 on holiday shopping at qualified malls—you’ll get a cool $160 back.

Learn more or apply for the Discover More Card now »

This card carries no annual fee for Costco members, serves as both an American Express credit card and your Costco card, and comes with excellent cash back rewards. You’ll earn 3% cash back for gasoline and restaurants, 2% cash back for travel, 1% cash back everywhere else, including Costco. Plus, there’s no limit on how much cash you can earn, and no minimum spending amount required to earn the full rewards amounts.

Compare this to Blue Cash from American Express, which pays 5% cash back on gas purchases but only after you have charged $6,500 to the card within a year.

Learn more about the American Express Costco True Earnings card now »

Between July 1 and Sept. 30, 2008, Discover More cardholders will earn 5% cash back on gas and hotels.

Cardholders earn 1% on all other purchases, and 5% in select categories every three months. After the gas/hotel promotion, Discover More cardholders will get 5% back on purchases at grocery stores, restaurants, and movie theaters.

Note that there is a $400 spending max on 5% rewards per promotion period, but cardholders get unlimited 1% cash back on all purchases.

Learn more about the Discover More Card or apply now.

Be sure to specify that you want to switch cards to a card with rewards, however, as the customer service rep will most likely be trained to try to get you to open a new card and keep your old card.

When switching to a credit card with rewards, your APR will probably go up. If you carry a balance on your current Citi credit card, think long and hard before trading that card in for a rewards card. Any cash or points back that you earn may not make up for additional interest you will pay on that balance.