SAKwiki – Arguably the most complete list of Wenger and Victorinox models
Swiss Army Knights forum – SAK forum at Multitool.org
SAKHome – Trond’s most excellent SAK pages containing a wide variety of information, analysis and opinions.
SmartKnives – A large index of SAK models with photos, as well as several special pages on specific lines or models; many dead end links, though.
SwissKnives.Info – Marsax’s SAK blog that focuses mostly on Alox models.
I Love SAK’s – Photos of many unique SAKs from a personal collection.
Swiss Army Knife Collector – James Christain’s pages for SAK collectors, with lots of original scans.
SwissKnives.Info Collectors Resources – a list of links similar to this one, but with a few more