Viking Invasion

The Lordz Site - Mods for the Total War Series
Offers Napoleonic mod featuring more than 75 new units, mobile artillery, warships, techtree, buildings, flags, banners, portrait images, game pieces, battle formations etc.
http://www.thelordz.co.uk/

Wes Whitaker's Total Modification Site
Medmod mod offers new graphics, rebalances units and buildings and introduces new concepts into game like standard and compound bows.
http://wes.apolyton.net/

ActionTrip.com
[8.5/10] Reviewed by Uros Jojic. "For all intents and purposes, this is a very solid expansion pack." Also includes screenshots and user comments. <small>(June 10, 2003)</small>
http://www.actiontrip.com/reviews/medievaltotalwarvikinginvasion.phtml