I'd never encountered Peeps until I came to live in the USA. Now they're so much a part of Lent and Easter that I hardly notice them, except to eat some now and again. (A friend feeds Peeps to her horse as a treat - he's apparently wild about them - so she has a great time after Easter buying up dozens and dozens of boxes of Peeps at the post-season sales.)
It seems that this year marks the 60th anniversary of Peeps. Here's a video report for the occasion.