This year make taxes easy. Digital receipts and invoices flood our inbox. In order to organize them for taxes or for expense reports, this is the easiest tool to use. Just click on "Get My Receipts" in Gmail, and it'll organize your receipts in a spreadsheet.
cloudHQ have a great record with creating time saving tools that simply work well :) I used to do some Gmail automation to achieve the same task of tagging my payments and invoices and like seeing a simple plugin like this to make it easier.