How to reproduce:
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1. Load http://webeng.sfbay/plugin-test with IE
2. Click on link "Test install" to install "6 Beta" version
3. Security Warning message will pop up
"Do you want to install this software? "Java Se Runtime Environment 6.0"

Screen shot is attached.

Should be version "6"
The same Security Warning message is displayed while do online installation, both jdk-6-beta-windows-i586-iftw.exe & jre-6-beta-windows-i586-iftw.exe from http://jscpreview.sfbay/javase/6/download.jsp:
Name: Java(TM) SE Runtime Environment 6.0