This is the classic example of using a shared spreadsheet to make it easy to share expenses for a group event. This group uses a blog to communicate, they have a shared calender, shared photos online, and a couple of spreadsheets where they've tracked expenses (linked on the right side of the blog). Everyone enters their out of pocket expenses, and the spreadsheet calculates the net due to/from each person.
|Site:||Shared blog AJC 09/07|
|Spreadsheet:||Shared expenses accounting|