Hah! (We’re back ;-) ) It’s as easy as that:
Needless to say that other formatting – like Currency formatting – works as well
Check out Formatting Types on the .NET Framework Developer's Guide or SteveX Compiled - String Formatting in C# (nice cheat sheet) for more examples.
Cheers!
Daniel
PowerShell supports this syntax too
"{0:C}" -f 1234567890