For computer science tenure-track faculty, the standard teaching load at a major research university in the US is 1-1 (meaning 1 course each of the two semesters). My understanding is that in math the standard teaching load is 2-1 (two courses one semester, one course the other).
What are the standard teaching loads in other fields (e.g. physics, history, etc.) at major research universities in the US?
In the largest national survey collecting this data is the National Study of Postsecondary Faculty. (http://nces.ed.gov/surveys/nsopf/design.asp) It was last conducted in 2003-4. The average number of classroom hours for full-time faculty ranged from 7.9 in engineering to 11.0 in fine arts (as of 2003). See: http://nces.ed.gov/das/library/tables_listings/showTable2005.asp?popup=true&tableID=2128&rt=p