If you're using SQL Server 2000, Query Analyser has a very useful feature for this:
From the Tools menu, show the Object Browser. In the object Browser's treeview, open up your database to expose the User Tables. Then just right-click on the object of interest, and you get the option to script it as CREATE (and also options to script it as UPDATE, INSERT, etc). Then all you need to do is change the Table name and run the script, as with JayKusch's answer above.
It's been very helpful to me and saved me from having to type too much on many an occasion!
HTH