Perhaps this might be of use :
http://www.pcreview.co.uk/forums/thread-1495473.php

Pertinent portion of the response:

You can use the WMI Win32_PowerManagementEvent to detect a standby event
(and maybe other things as well). Try the script below and see what you get
as result.

Win32_PowerManagementEvent WMI class
http://msdn.microsoft.com/library/e...gementevent.asp

A vbscript example (will loop forever until terminated):

Set colMonitoredEvents = GetObject("winmgmts:")._
ExecNotificationQuery("Select * from Win32_PowerManagementEvent")

Do
Set strLatestEvent = colMonitoredEvents.NextEvent
Select Case strLatestEvent.EventType
Case 4
MsgBox "Entering suspend."
Select Case strLatestEvent.EventType
Case 7
MsgBox "Resuming from suspend."
Case 11
MsgBox "OEM Event happened, OEMEventCode = " _
& strLatestEvent.OEMEventCode
Case 18
MsgBox "Resume Automatic happened"
End Select
Loop

I imagine there are any number of ways to do this, since I use Vista,
I've configured a scheduled task that's triggered by the event that's
logged during resume (see the exported & detailed info. below) -

Log Name:      System
Source:        Microsoft-Windows-Power-Troubleshooter
Date:          6/17/2008 12:20:06 PM
Event ID:      1
Task Category: None
Level:         Information
Keywords:
User:          LOCAL SERVICE
Computer:      CUBE
Description:
The system has resumed from sleep.

Sleep Time: 6/17/2008 4:18:31 PM
Wake Time: 6/17/2008 4:19:46 PM

Wake Source: Device -ACPI Sleep Button
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
 <System>
   <Provider Name="Microsoft-Windows-Power-Troubleshooter"
Guid="{cdc05e28-c449-49c6-b9d2-88cf761644df}" />
   <EventID>1</EventID>
   <Version>0</Version>
   <Level>4</Level>
   <Task>0</Task>
   <Opcode>0</Opcode>
   <Keywords>0x8000000000000000</Keywords>
   <TimeCreated SystemTime="2008-06-17T16:20:06.868Z" />
   <EventRecordID>190913</EventRecordID>
   <Correlation ActivityID="{0CFCA687-1520-42FE-8B54-462E78B6100C}" />
   <Execution ProcessID="1136" ThreadID="2216" />
   <Channel>System</Channel>
   <Computer>CUBE</Computer>
   <Security UserID="S-1-5-19" />
 </System>
 <EventData>
   <Data Name="SleepTime">2008-06-17T16:18:31.328Z</Data>
   <Data Name="WakeTime">2008-06-17T16:19:46.983Z</Data>
   <Data Name="SleepDuration">14665</Data>
   <Data Name="WakeDuration">492</Data>
   <Data Name="DriverInitDuration">399</Data>
   <Data Name="BiosInitDuration">481</Data>
   <Data Name="HiberWriteDuration">23241</Data>
   <Data Name="HiberReadDuration">0</Data>
   <Data Name="HiberPagesWritten">0</Data>
   <Data Name="Attributes">20499</Data>
   <Data Name="TargetState">4</Data>
   <Data Name="EffectiveState">5</Data>
   <Data Name="WakeSourceType">4</Data>
   <Data Name="WakeSourceTextLength">17</Data>
   <Data Name="WakeSourceText">ACPI Sleep Button</Data>
 </EventData>
</Event>