Just wanted to get into the development of OllyDbg plugins and displaying the call stack is a feature that I missed in Olly 2.x so I wrote a little plugin which offers some basic information about the call stack.
The Function at the top is always the last called and a double click on a row brings you to the disassembly view with the selected address. But you need a target loaded and it must be in suspended mode else the window wonÂ´t show you the call stack. Also it doesnÂ´t update when you step while having the window of the plugin open so you need to press the plugin function in your menu again to update the view.
Plugin + source is in the attachment - tested with OllyDbg 2.01b2 on WinXP SP3 and Win7 SP1