viral holiday video可以理解为holiday viral video，应当是针对某个节日的短片。viral video似乎没有恰当的译法，我翻译成病毒式短片以贴合英文原文。其英文解释如下。

http://en.wikipedia.org/wiki/Viral_video

The term viral video refers to video clip content which gains widespread popularity through the process of Internet sharing, typically through email or IM messages, blogs and other media sharing websites. Viral videos are often humorous in nature and include televised comedy sketches such as Saturday Night Live's Lazy Sunday and unintentionally released amateur video clips like Star Wars Kid, the Numa Numa song, The Dancing Cadet, The Evolution of Dance and web only productions such as I Got a Crush... on Obama or even [Without Warning] (by Wired Comedy on Youtube). Some "eyewitness" events have also been caught on video and have gone viral, including the Battle at Kruger.

所謂的「病毒行銷」（Viral Marketing），是指利用消費者原有之社交網絡，不斷傳遞與複製傳播內容而構成的行銷現象，加強消費者對品牌與產品的認知與興趣。簡單的來說，就是一段很好笑的笑話、很瘋狂的短片、或者一首很白痴的歪歌，造成網友間的瘋狂轉寄。機造影片因為其趣味與輕薄短小的特質，加上切合產品主題與風格，逐漸成為遊戲市場的重要行銷工具。病毒行銷方法對台灣的網路公司來說，不會是陌生的技巧，甚至可以說是最基本的入門功夫。

來源： http://www.gameimp.com/archives/2007/06/11/840/

Viral Marketing - 病毒散佈式行銷。可遇不可求，一旦成功，可發揮低成本、高成效的廣告效益。網路上常見的Viral Marketing，如Viral Video，大多要先達到某個Tipping Point - 關鍵點，才「爆發急性傳染」如瀏覽人次突破百萬、登上電視新聞、或某高流量部落格無意中提到。當今人人喊創意，個個講病毒，但市場中毒的機率，就像中樂透一樣，不高。為提高成功率，行銷者應同時設計、執行多個Viral Marketing計畫。

來源： http://hellohullo.wordpress.com/


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Note added at 1 hr (2008-08-14 08:21:55 GMT) Post-grading
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我也考虑到病毒容易产生误解，所以采用了“病毒式”，这样就有别于“病毒”。