DVD/Blu-ray Extra Short Anime of Toaru Kagaku no Railgun [Update Apr 14]

According to Neowing, the DVD & Blu-ray volume 1 limited editions of "Toaru Kagaku no Railgun" will include an extra short anime. It will be released on January 29th, 2010. Short novel episodes of "Toaru Majutsu no Index" will also be bundled with the limited editions of the eight volumes. The episodes are called "Kanzaki Kaori chapter".

Source: Neowing

Updated on April 14th
According to the official website, the DVD & Blu-ray volume 5 will include another extra anime. It will be released on May 28th.

Source: [ur=http://www.project-railgun.net/contents/hp0013/index01070000.html]Railgun official website[/url]