Even though the intent is to make the screenshot look more professional, there is a flaw that makes the result look unprofessional. The flaw is that the text in the title bar and the location bar isn't rendered as it would be on a Mac. See the difference in this reference screenshot I found: http://macamour.com/blog/wp-content/uploads/2008/06/safari4_....

Here are the problems with the text rendering that I could spot:

• The current text has too much hinting and not enough anti-aliasing. Use different font smoothing settings in whatever code you're using to overlay the text.

• The font appears to be Aktiv Grotesk, but should be Lucida Grande.

• The baseline of the URL text is not aligned with the baseline of "Google" in the search bar.

On the other hand, the light-gray-shadow embedding effect of the title looks good.

As a side note, the explanatory text has very many small grammar and capitalization errors. Getting the text revised by a friend might help. But it's not too bad, because the controls are really all you need to use the site, and the controls are explained pretty clearly.

Also, I like the fact that you give default values for everything, so you can see exactly how the app works without digging around for an image.