Pet Peeve #132: Web forms that have the “Clear form” button right next to the “Submit form” button.
Pet Peeve #133: Web forms that have the “Clear form” button, period.
Where possible, save yourself the grief of accidentally erasing all of your work by typing your thoughts out in a Notepad or TextEdit window, and copying and pasting it into a webform to submit to a blog, etc. That way, even if your Internet connection dies midway or you click the dreaded Clear Form button, you don’t lose all of your work.