My spreadsheets tend to be too individualized to be worth sharing. Not the data within them, but they all cross link and reference and pull from other spreadsheets - they're much too tied together to be any use alone. My "Time to FI.xls" spreadsheet, for example, pulls data from four other spreadsheets (a rental analysis, a ymoyl income/expenses, a housing projection, and a net worth one), each of which also pull from each other and others. I have at least 10, and regularly utilize 5-6 or so, but they're not useful without the whole package, most of which would be irrelevant to other people.
I imagine others are in the same situation - even if the data within were sanitized, they're so specific and individualized they aren't worth sharing. But it's a nice idea for sharing more "basic" spreadsheets. I just don't have any to contribute. :D
There have been a few other good ones posted on these forums (a time to fi sheet, ymoyl sheets, etc.) someone could compile here via linking to those other threads, if so inclined.