I have to say that the UK's HMRC web-based self-assessment site has always struck me as being a really good example of tax returns done right. It presents as t

I have to say that the UK's HMRC web-based self-assessment site has always struck me as being a really good example of tax returns done right. It presents as the equivalent of the paper form but with many of the fields autocalculating for you, and offering contextual help. Quite nifty.