Fun UI and error message: http://thedailywtf.com/forums/59766/ShowPost.aspx http://thedailywtf.com/forums/thread/79538.aspx

How to drive user away? A big login box... http://fishbowl.pastiche.org/2007/02/27/irony_of_the_day or too many features in single screen - http://worsethanfailure.com/Articles/Classic_WTF_-_Enter_the_Matrix.aspx

UI - http://discuss.joelonsoftware.com/default.asp?design.4.515082