[PRODUCT NAME]
{tagline}
[email form]
...on a web page? Is it that it's centered with a large background image? How much is this ACTUALLY ripped directly from another site versus just design 101? Did you look at the HTML and see that they had copied a lot of the same styles/classes/IDs/element structure?
I'm not denying the similarity, but I also think that it's easy to jump to conclusions when accusing someone of stealing a design. No, I don't have anything to do with radishapp.com either.
disclaimer: I have been known to surf the web when I'm not feeling motivated to design a form, but I never copy a single design explicitly.