Inline Form Labeling

• In-Field Labels jQuery Plugin
• jQuery Inline Form Labels | Trevor Davis
• jquery-checkbox – Project Hosting on Google Code

Form Validation

• jQuery validation plug-in – comment form example
• A jQuery inline form validation, because validation is a mess « Position Absolute

Modal Windows

• nyroModal :: jQuery Plugin
• ThickBox 3.1

Misc

• jQuery BlockUI Plugin (v2)
• jQuery Cookie Plugin
• David DeSandro: jQuery Masonry
• jQuery metadata plugin