Need MS Excel?

Let's be honest: all the cool stuff is nice, but in reality we all still need to use (and understand) a basic spreadsheet software, for example MS Excel. Here are some great links in case you need a refresher or want to see some more advanced applications:

1. The Absolute Beginner's Guide to Spreadsheets (Ann K. Emery)
2. Learn Excel: An In-Depth, Thorough Tutorial (With GIFs) (Ann K. Emery)
3. MS Excel on Steroids!
4. Excel Map Hack (John Nelson)
5. More assorted good stuff
6. Excel Mini Tutorials on YouTube (Barb Henderson)