list normal open windows (like Alt-Tab or Task Manager does)

gistfile1.py

import win32con
import win32gui

import ctypes
_user32 = ctypes.windll.user32

excludes = (_user32.GetShellWindow(), win32gui.FindWindow('Shell_TrayWnd', None))

winlist = []
win32gui.EnumWindows(lambda hwnd, l: l.append(hwnd) if \
		win32gui.IsWindowVisible(hwnd) and \
		not win32gui.GetWindow(hwnd, win32con.GW_OWNER) and \
		hwnd not in excludes \
		else True, winlist)

# show results
print len(winlist)
for x in [(h, win32gui.GetClassName(h), win32gui.GetWindowText(h)) for h in winlist]:
	print repr(x)