Beryl is not just eye candy... "If you have Beryl installed, you can select windows for grouping by pressing [super]+s (the [super] key is usually the "windows" key) or by holding down the [super] key and using the left mouse button to draw a box around the window(s) you want to select. Once selected, you group them press [super]+g to group them. Once you've got your group, press [super]+t to tab them together. You've then got a handy group of windows that are tidy, and easily selectable.
To change windows, just hover your mouse over the title bar, or use [super]+left or [super]+right to cycle through the windows. scale plugin and the four desktop corners
Because the four corners of the desktop are the easiest parts to hit with your mouse, it makes sense to try and put some form of useful action in each of the four corners. The scale plugin has a number of options as to which windows get included in the when activated. You can activate all windows on all sides of the cube, or just the windows on the current cube face, or just the windows associated with the current application. It is this last option that can be useful for tasks that involve a whole bunch of windows from one application - like the gimp, or kopete.
You can set the actions for each corner of the desktop in Beryl settings manager. Under the general page, you'll find an icon for shortcuts in the left panel, and under that, a tab for screen edges."
Read more at http://liquidweather.net/howto/index.php?id=92
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A. Mani