If you’re still looking for a small Task Manager for your WM5 device, vBar 2.2 might be what you are looking for. Weighing at 21 Kb, it lets you close applications as well as easily to task switching very quickly.
Version 2.2 adds support for Windows Mobile 5, QVGA & VGA icons and an improved battery indicator.
vBar 2.2 is available for free.