Probably the best known are the Nepenthes, as the majority of species seem to be able to go to the trees on occasion. Some include: N. lowii, edwardsiana, macrophylla, fusca, maxima, robcantleyi, veitchii, ventricosa, alata, lingulata, izumiae, etc. The list is long here.
How could you forget Nepenthes epiphytica ? Come on now man ! hahaha
http://www.cpphotofinder.com/nepenthes-epiphytica-5247.html