Google Spreadsheet
About Google Spreadsheet: I don’t know, I don’t find myself collaborating on spreadsheets that often, to begin with. Also, it will certainly have less functionality than a desktop app. However: it will most certainly be a boon for mashup makers and it might make it easier for, say, a GIS Librarian to send or share data with a patron or vice versa. But more important than all of that is the possibility that it might startle people into realizing that there is a bright, easy, (inexpensive) beautiful world outside of Excel and the rest of the Office dungeon.
