To try a 1040 return, first make sure you check the step-by-step instructions below.
Step-by-step instructions.
Then go to http://www.taxsoftware.com/product.htm
Click on the ACCEPT button, and then click on the NEW button and enter any SSN in the format XXX-XX-XXXX on the Taxpayer ID field, any name on the Taxpayer name field.

Then select 1040 and tax year 2005.

Click on the Next button and enter any information you want.
You can edit and print the tax return as many times as you want when you finish. Just make sure you don't change the selections above.