|If you can get access to Excel 2008 for PC, you'd certainly impress me.|
Where I come from, it's 2007 and 2010 for Windows...never heard of 2008.
In any case, if you right click a sheet tab, chose View Code and paste this code into the pane that opens, it will insert the time in Column B whenever you make a change to Column A of that sheet:
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Column = 1 Then _
Target.Offset(0, 1) = Time
If you want the Date as well as the Time, change Time to Now.