Murine Typhus (Fleaborne Typhus) - http://www.dshs.state.tx.us/idcu/disease/murine_typhus/ FAQ from the Texas Department of Health.
Scrub Typhus - http://www.emedicine.com/ped/topic2710.htm Detailed information about this acute, febrile, infectious illness caused by Rickettsia tsutsugamushi and transmitted by trombiculid mites.
Typhus Disease Profile - http://entomology.montana.edu/historybug/typhus.htm Brief information about louse-borne typhus.
Typhus: AHealthyMe.com - http://www.ahealthyme.com/article/gale/100084835 Factsheet on the four main types of typus.