Soleron on 19 June 2010
effect/affect is my big one, but less/fewer is also annoying.
For the latter:
If the noun it is quantifying has many discrete objects that can be counted (e.g. cups, consoles, days) then use fewer
"Fewer consoles were sold..."
Whereas if the noun is collective and can't be counted (e.g. money, time, disk space)
"Less time was needed..."
