nano is such a lifesaver. It's pure Unix – does one job really well, doesn't try to be half an IDE like vi and friends, just a friendly little text editor that pretty much everyone can use within minutes. Nothing better for quick edits on remote systems beside never having to do quick edits on remote systems.
Ah I forgot about pico! I used to have way to crash it every time, something to do with the word wrapping. But it stopped being developed so we switched to nano.