Idea: Gnome-Like Taskabr For Windows

[Smobu]

In the Gnome desktop environment, applications opened will resize themselves to make full use of the task bar, but windows can only have a fixed task bar button width at one time.
Is it a program out there that can replicate this feature for windows?

[skwire]

I realise that this may not be what you're after but the bb4Win family of alternate Windows shells do what you want.  I been using bbLean/bbClean for six or seven years now.