The misguided notion that somehow more is always better.

• Main Entry: Feature Creep
• Pronunciation: /fee-cher,kreep/
  
• Function: intransitive verb
• Etymology: Middle English feture crepen, from the act of over-building something
• Date: December 24, 2009

Remember folks, flee from temptation to ‘gizmo’ up your site.

Instead, focus on workflow – that is the things your users want/need to do/learn from visiting your website.