Ryan Stewart misses undos on the Web. He cites the example of Google Reader where he accidentally marked all feeds as read, and did not get an option to undo it. There are many Web applications which support undos, and there are many desktop applications which do not. [Continue]
Aza Raskin explains why warnings should never be used when you mean undo. Warnings make the user cautious about the action, which takes more time to resolve and can be frustrating for the end user. A guarantee of undo can provide a sense of security and let the user take direct actions. [Continue]