Source: Smashing Magazine

• the registration link is titled “sign up” (40%) and placed in the right upper corner,
• sign-up forms have a simplified layout to avoid distractions for users (61%),
• sign-up forms are one-page-forms (93%),
• sign up forms attract visitors by explaining the benefits of registration (41%),
• titles of the input fields are highlighted bold (62%)
• no trend in the label alignment can be identified,
• designers tend to use few mandatory fields,
• designers tend to use few optional fields,
• vertically arranged fields are preferred to horizontally arranged fields (86%).