When you install the GHI SDK, the templates are installed for the default location on the current user account. For example, on Windows 7, they will be installed in such path:
C:\Users\UserName\Documents\Visual Studio 2010\Templates\ProjectTemplates\Visual C#\Micro Framework
This location is configruable in Visual Studio settings.
If you use a different account, the templates will not show up because of the different user name.
To solve this, re-install the GHI SDK under the second account or
make a special path that is shared between different accounts or servers. This shared path will include the installed templates. The project templates path can be set in Visual Studio->Options->Project and Solutions and then set “User project templates location”.