One of the new features in .NET Framework 3.5 SP1 is StringFormat support within {{Binding}} expressions to enable easy formatting to bound values.
So, if some TextBlock control need to be bound to some object's properties (let's call them Max and Min) and the value of the TextBlock's Text property need to be in [Min - Max] format you can then write something like this:

    <TextBlock>
        <TextBlock.Text>
            <MultiBinding StringFormat="[{0} - {1}]">
                <Binding Path="Min"></Binding>
                <Binding Path="Max"></Binding>
             </MultiBinding>
         </TextBlock.Text>
     </TextBlock>