Learn Excel by yourself is a list of Excel tutorials, tips and resources based on different learning methods.
Contextures - Debra Dalgleish has a huge range of tutorials including loads on PivotTables.
Microsoft Excel - The Mothership.
Charting and Dashboards
Peltier Technical Services, Inc. - If there's a chart for it you'll find an example on Jon Peltier's site.
Free chart element alignment tool a must have for anyone who works with charts. No more fiddling with chart titles, legends, labels and more. This tool aligns them at the click of a button.
DataPig Technologies - Some slick Dashboard tools.
HelpMeViz - Get help with data visualisation ideas and feedback.
Templates and Utilities
http://www.jaxworks.com/library.htm - JaxWorks offers hundreds of Free Excel workbooks and spreadsheets, and associated MS Word, PDF and HTML documents, that cover a number of financial, accounting and sales functions at all skill levels.
Vertex42 - Loads of free high quality Excel templates.
ASAP Utilities for Excel - The best utility for saving time in Excel.