Hello Bob,

>I have imported data into my SQL 2008 database using the Import Wizard. When running the package I had the option to save the SSIS package into a .dtsx file.
>
>How do I access this file for future imports?

If you have already created an SSIS packages, it is best to save it for further use.
You can save it on file system on a SQL Server or on an SSIS server.

In both options, you can easily re-run the saved ssis package.
In order to run it later, open SSMS. Connect to the SSIS server where you saved or deployed your package.
Then the package will be listed in the corresponding sub folders below the SSIS server

Please check the export to excel sample at http://www.kodyaz.com/articles/export-data-to-excel-sql-server-integration-services-ssis-package.aspx

There in that tutorial, you will find how to create an package using wizard, save it on SSIS and use it later.

I hope that helps,