So what good general shortcuts or skills have you developed?
Other than GTD methods, of course?
Some macro, procedure, etc?
One I recently developed in tandem with an expert Excel macro writer is one to compare two spreadsheets cell by cell and note any differences. You would certainly think that something like this would already exist, but a quick googling turned up nothing except offers to sell such a tool. Weird that Excel would lack such a feature, in that DOS (and maybe Windows) has the very useful fc command (file compare), and unix has the very useful ones diff and sdiff (file difference and side by side file difference).
The macro could use further refinement since right now it just stops and exits at the first difference. A good extension would be to make a note and give the user the option to "find next".
But in general being comfortable with whipping up even small Excel macros is a great skill to have for many people, and I plan to further develop my fledgling proficiency in said skill.