Consider the Visual Studio’s highly-customizable configuration of the text editor.
The value I’d like to tweak is the highlighting of the found search string. See circled below.
Question: in Visual Studio 2010 Beta 2, or Visual Studio 2008 which setting in the Fonts and Colors dialog box will allow the highlight/surround color to be changed?

Try changing Colors->Selected Text and Colors->Inactive Selected Text (in Tools->Options->Environment->Fonts)