As I use Excel extensively at work. About a month ago, I discovered this free forum that allows you to ask questions and get answers by experts. I've learned so much recently, that previously labourious research and financial reconcilation in Excel have been made much easier and enjoyable (e.g., Pivoting Tables, Advanced Formulas, Table matching, etc).
The Forum posts are also mapped to the microsoft.public.excel.* newsgroups
http://www.excelforum.com/showthread.php?t=584092