Very, very helpful.  I like the pace, the tips, and the examples.  I also like the list comparison feature as that minimizes my need to loop in Access.  I'm also using Mac Excel 08 (Windows Excel to be used at my new job) and most of the functions translated with the exception of Insert Table (insert List on Mac) and naming a Table Range, which isn't an option on the Mac.  I'm not sure which module the drop-down list is covered in (I bought 4,6,7) as I'd like to know how to calculate functions based on the chosen list value (as demo'd in the Match & Index section of this module where users can choose courses from a class list.  On my spreadsheet, I was able to produce my drop-down course list but the match function refers to a static course row.).  Overall, I was able to follow along and create examples as you taught, pausing where needed.  Great job!