Features:
- It's not in .NET so it only runs on ARM.
- Less than 9K in size.
- Optimized in size.
- Vey very minimal.
- Simple Interface.
- Only waists a menu and an icon.

Update Description:
v1.0:
- Little more than the previous 9K but still under 11K.
- Added an extra "keep light on" option to keep the backlight on for games or books.

v0.9 RC:
- With some nice features requested by Erik (the "close all" feature) and Peter ("reset"&"suspend").

v0.8 PR:
- Even smaller. Now less than 8K.

v0.2 Beta:
- Even smaller. It's almost complete.
- The message box is topmost and the icon is monochrome.

SOURCE

http://www.fraganestis.com/chthon/software/SmartTask

Reviews:

***** [Oct 9, 2007] by JCRayon using Dopod 838pro w/ WM6
Good little task switcher and task closer with some nice additions like suspend and reset. Installation instructions for those who might have trouble:
To install, e.g. to Storage Card:
1. Make new directory \Storage Card\Program Files\SmartTask
2. Copy smarttask.exe to \Storage Card\Program Files\SmartTask
3. Make a shortcut from:
\Storage Card\Program Files\SmartTask\smarttask.exe
to
\Windows\Start Menu\Programs folder, and rename it SmartTask
4. To have it start automatically, make a shortcut from:
\Storage Card\Program Files\SmartTask\smarttask.exe
to
\Windows\Startup directory.

***** [Nov 17, 2006] by Ding-Yi Chen using iPAQ rx1950
Simple but functional. The only flaw is its starting screen is a bit ugly and confusing, but it does not affect the real use.

***** [Sep 6, 2006] by sawari using Dopod 818Pro
I am looking for best task switching/manager program, and finally i got this, the best so far, because it is working, really working, compared to the other, even commercial one. Very Good.

***** [Mar 17, 2006] by Peter using iPAQ 1950
Pretty amazing program! Does exactly what it promises to do. Compared to some of the other bloat ware programs out there it is a real delight to use. I would recommend it to everyone as a must have program.