Top image from LOL-Lost, and...
bottom from LostROFL: LOST haz a hot dog @ teh DHARMA Capsule Dump
From old files I've downloaded, sorry I don't remember who to credit. This one is a sig from a Lost forum.
These two graphs were among several at Lost-related Graph Jam page.
This one below was on another page:
This post is from LOSTROFL reader and contributor Andrea!