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/
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/
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. - http://www.actiontrip.com/reviews/medievaltotalwarvikinginvasion.phtml