Will my 4th gen.iPod touch fit into an iPhone 4 case?

Here's the case: http://www.iheartdropdead.com/product.php/7483/salem_iphone_case

Yes it will I have bought that pretty much exact case and it fits perfectly. It just makes your ipod look like an iPhone though, like more square. No problems though.

No, unfortunately it will not. The iPhone is both thicker and longer than the iPod touch, and the fit is extremely loose. At times, this is unfortunate as there are more options for the iPhone case than the iPod touch case.