nope seen em all, except green flash - couple I would add to that list would be a seriously bright super nova (a la 1987A) which I didnt observe knowlingly at the time, if at all, and a daytime comet :-))))) (cant get enough comet action, lots of variations on those) oh and telescopicaly viewable comet impact on jupe, which I just missed seeing in '94 ;( and a meteor
storm (of which if you are willing to travel there is a possible one next year in the september 2007 Auragids see
http://astro.cas.cz/nuncius/nsiii_06.pdf
lots of great visual earthly phenomena I havent seen yet either (like the green flash)
would also say there's aurorae and then theres
aurorae - a full on coronal display is a looooong way from a few beams and glows
EDIT: woops havent seen an annular solar eclipse! and the incredible variety involved with total solar eclipses is pretty wide to be generalising too I guess