Tombstone:
Care to elaborate a little.
Spybot itself (SpybotSD.exe) does not have a notification area (system tray) icon and always appears in the taskbar unless it is run with the "/taskbarhide" parameter. This is because you do not have to have the SpybotSD.exe program running continually. You only have to run the SpybotSD.exe program to update, immunize, scan, etc., and those activities are normally of relatively short duration and normally require interaction. Therefore when you minimize the SpybotSD.exe it appears in the taskbar.
On the other hand TeaTimer (TeaTimer.exe), when activated, runs continually and does have a notification area (system tray) icon to facilitate interaction.