Only a few stand out, although the ones that use clips from episodes are the worst. D:
Anyway, Kibou no Kakera from PPGZ, Hito Toshite Jiku ga Bureteiru from Sayonara Zetsubou Sensei and Motteke! Sailor Fuku from Lucky Star. Don't think I've watched many endings, I usually just skip to the next episode. don't say 'lazy' from K-ON! is an exception.