My favorite of these is 7 Songs Belfast. Its offerings are a good representation of what I have in my embarrassingly large library of the man's music- a lot of covers and rearranged versions of songs from Sun Kil Moon and Red House Painters' studio albums. The song "Michigan" is heartbreakingly beautiful-- lyrically, it may be one of his best songs.
I love that you can listen to songs you know from earlier albums- like "San Geronimo" fron RHP's Ocean Beach- and get something completely different. Then you can go back and forth over which one you like better. Geeky, I know.
I can't find anything from 7 Songs Belfast up on youtube (is it enough just to talk about how good it is?), so indulge me with this cut from Ocean Beach that I can't stop diggin' on: