Go to www.irs.gov
On the left side of the screen it will say "More Forms and
Publications." 
Click on Download Forms and Publications by. Click on
one of these links to start searching for the correct form.
Here are some online tax resources that seem to be reliable.
www.taxcut.com is backed up by H & R Block
www.turbotax.com seems to be reliable and has been around for a few years.
If you want to file taxes using your computer I would suggest purchasing the software from a retail store like Staples, Best Buy, Wal Mart, or anything like that.
Lets look at www.IRS.gov and see what they have.
You can find lots of good information from this website. It should be updated.
From www.irs.gov you find any form for this years taxes. I mean any form. There are hundreds of forms.
To get tax forms:
Go to www.irs.gov
On the left side of the screen it will say "More Forms and
Publications."
Click on Download Forms and Publications by. Click on
one of these links to start searching for the correct form.