You're getting sleeeeeepy....
ftaok's troubleshooting tip is aok about the trackpad. You've already verified several of the points below but for completeness I'll ask again...
A. If it isn't asleep.... verify the following if you can...
(1) You have a newer iBook running updated OS X.
(2) In Energy Saver pane of System Preferences "use separate..." for display is not checked and nothing there is set to the "Never" setting.
(3) You don't have your Speakable Items turned on under your computers On/Off tab of the Speech pane's - Speech Recognition Tab (Go to System Prefercences - Speech - Speech Recognition - On/Off).
(4) No other programs are interfering with the sleep mode.
(5) You're not running some odd little weather program, Screensaver, or Desktop background updating program that updates at certain intervals in congunction with certain internet access methods.
(6) Still didn't hear from you about your internet connection... (The concept is that something ... like some internet connection things... demand your computers attention).
(7) All this done... you'll have to recalibrate your battery, then reset your Power Manager as drastic last ditch attempts to fix the problem.
B. If it is asleep...you may need to...
(1) recallibrate your battery... and if this doesn't work;
(2) reset your Power Manager.
An ideal thing here that would allow a decisive diagnosis, would be if you could use your "GRAB" program to take a screen capture of your System Preferences Energy Saver pane and post it here.
