Maybe, depending on where you are and when "last year" was.
The US postal service began a few years ago issuing "forever" stamps that are first-class postage "forever" ... that is, they can be used to mail a first-class letter even if the cost of first-class postage goes up. These will say "forever" on them, and will not have a denomination other than that. They're priced at whatever the current first-class postage rate is.
If a stamp does have a denomination on it, that's the value of the stamp. If that's insufficient for current postage rates, you will need to add stamps to make up the difference.
It varies from year to year for the cost of postage stamps. Right now in 2010, it cost around 44 cents for stamps..
Stamps did not exist in that year. They were introduced in 1840 in Great Britain.
The US issued the first postage stamps in 1847.
Spain
Hundreds of stamps are issued each year around the world. Each country will issue different stamps throughout the year.
They are still valid, but you have to add additional postage to make up the 44 cent rate. Unless they are the Forever Stamps, in which case you can still use them for up to an ounce of First Class postage.
Germany as a country did not have a postage stamp until 1872. Various German states had postage stamps dating back to 1850.
On March 3, 1863, the US issued its first postage stamps, they were 3 cents, for a one half ounce letter.
In the US, they are still valid for postage at their face value. The US has never de-valued their postage stamps. For a collector's value, you would have to consult a catalog to identify and value the stamp. Look for one at your library or on line.
Great Britain issues stamps without a country name. Being the first country to issue stamps, it didn't need one. Since then, all of their stamps have shown a picture of the ruling monarch on them.
Postage stamps were first commonly available in Great Britain. The One Penny Black is considered the first stamp available for sale. They were printed in 1840. The following year the One Penny Red was issued, one of the earliest and fairly common stamps available.
In the year 1931 in the United States, First Class postage was 2 cents. It went up to 3 cents on July 6th of 1932. That covered the first ounce of postage.