1. Problem is, not everyone will know that they're supposed to hit Enter to submit, so you're already needlessly frustrating a percentage of your users (albeit,

1. Problem is, not everyone will know that they're supposed to hit Enter to submit, so you're already needlessly frustrating a percentage of your users (albeit, probably a small percentage) by hiding the submit button. Here's a bit more discussion on the topic, from a question I asked on UX StackExchange a while back: http://ux.stackexchange.com/questions/8876/usability-of-hiding-the-submit-button-and-using-the-enter-key-to-submit http://ux.stackexchange.com/questions/8876/usability-of-hidi...