Mushihime-sama and Mushihime-sama Futari: I've never played it but I've seen it played on YouTube. I like it for the uniqueness of it but ODG this game will cause shell shock if you ever seen (or played) it in action :blink: .

Almost anything Cave or Treasure.

Radiant Silvergun (Saturn, XBLA release sometime this year ^_^ )
http://www.youtube.com/watch?v=EGNSdcy-apU (Saturn, XBLA)
http://www.youtube.com/watch?v=CrPLhATu9pU&feature=related (PS2, X360 region free)
http://www.youtube.com/watch?v=T8cG1BG8Xwg&hd=1 (iOS, X360 NA/EU retail)
http://www.youtube.com/watch?v=P1TI1SBImgM&hd=1 (XBLA)
http://www.youtube.com/watch?v=wotZMGkR_0M (X360)
http://www.youtube.com/watch?v=SzfIMgrzfKo&hd=1 (iOS, X360 region free)
http://www.youtube.com/watch?v=Ti1n4GhGuRQ (Arcade)
http://www.youtube.com/watch?v=9Nno04ppjss (PSone, Saturn)
http://www.youtube.com/watch?v=yOL5WUfwmh8&hd=1 (X360, iOS)
http://www.youtube.com/watch?v=tzCjwzkJQOU&hd=1 (PS2, X360, iOS)
http://www.youtube.com/watch?v=dl4_QxKDSOs (SNES)

Also, http://www.youtube.com/watch?v=dl4_QxKDSOs coming to Xbox 360 this May, and http://www.youtube.com/watch?v=1Ckkng-FKEs releases next week. The latter being region free. Plenty more from other developers, but I've taken a liking to how Cave's games play, even if I am terrible at them.

I'm still relatively new the the genre and I definitely can't afford all of the above games, though I've played most of 'em and spent a good chunk of time watching videos of the ones I can't play.

Perfect Cherry Blossom is the only danmaku I've played.

Touhou. I probably played #8 (Imperishable Night) the most, though #12 (Undefined Fantastic Object) was probably the best.

I have yet to play #12.5 (double spoiler) and #12.8 (fairy night) however.

http://www.youtube.com/watch?v=zxL52rdFFa4 is the ultimate bullet hell. No superficial things like stages, bosses, or having to shoot. Just a ship and countless projectiles flying everywhere, all the time.

Vapour Trail on the Megadrive.