On the 757 RB211s and 767 CF-6s, only the cowl ring is anti-iced. The 211's have a small rubber tip (US technical nomenclature "dohicky", UK technical nomenclature "thingy") that supposidy sheds ice.
Other times A/I should be used is when encountering volcanic ash and in severe turb - A/I increases the stall margin of the engine.
[ 09 August 2001: Message edited by: Roadtrip ]