WordNet (r) 3.0 (2006):

light touch
    n 1: momentary contact [syn: brush, light touch]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "light touch":
   breath, brush, caress, contact, cutaneous sense, feel, feeling,
   fingertip caress, flick, glance, graze, hand-mindedness, kiss,
   lambency, lap, lick, rub, sense of touch, stroke, tactile sense,
   taction, tap, tentative poke, touch, whisper