Tog (Bruce Tognazzini) is bugged. Tog is "is a principal with the Nielsen Norman Group, the ‘dream team’ firm specializing in human-computer interaction." Before that, he was Lead Designer at Web MD, and before that was a hotshot, user-focussed engineer at Sun.
Until today, Tog had a list of 7 items labeled the "10 Most-Persistent Design Bugs." Today, he added the final 3 and reports many, many more on the main page of The BugHouse.
#10 appeals to me a lot. Tog calls it "Focus-stealing." Say I have three IM windows open and am typing in one of them. I click Enter and suddenly realize that at some point during my typing, another IM window suddenly grabbed the focus away, and I find I have sent part of a message intended for person A to person B. That can get downright embarassing.
In point of absolute fact, as I started this posting TypePad had not QUITE completed drawing its window, and when I had typed the first letter in the Title block, TypePad suddenly switched my focus to the Post Continuation block.
Do have a look at all 10, and the additional categories: Pandemic Bugs, Application Bugs, Websites & Browsers, OS-X, Window, Multiple OSs, Networks, Security Bugs, Hardware & Drivers, and Programming & Command Lines. Pack a lunch and some beverages — you might be there a long while.