StrokeIt is absolutely amazing in XP and under ( it hasn't been updated years ago
). Over only 900Kb of private memory usage, fast, stable, drag & drop enabled, intuitive, near perfect recognition of gestures, ...
I use gestures for example to move between the apps I use most, like my file manager or browser. It's impossible to change so fast using taskbar or alt+tab.
I have gestures for showing PowerPro menus with documents, apps, scripts... Another to close a window, to invoke FARR's window, to move between virtual desktops, to show my latest clipboard items, ...