Feature films:

• Nausicaä of the Valley of the Wind (1984)
  (If it appears distorted adjust the aspect ratio in your media player. I find 16:9 in VLC to be best.)
  Screencap | Soundtrack
• Castle in the Sky (1986)
  Screencap | Soundtrack
• Grave of the Fireflies (1988)
  (Dual-audio, English+Japanese)
  Screencap | Soundtrack
• My Neighbour Totoro (1988)
  Screencap | Soundtrack
• Kiki’s Delivery Service (1989)
  Screencap | Soundtrack
• Only Yesterday (1991)
  (Dual-audio, Chinese+Japanese.)
  Screencap | English Subtitles | Soundtrack
• Porco Rosso (1992)
  Screencap | Soundtrack
• Ocean Waves (1993)
  (In Japanese only. Includes soft-coded English subtitles.)
  Screencap | Soundtrack
• Pom Poko (1994)
  Screencap | Soundtrack
• Whisper of the Heart (1995)
  Screencap | Soundtrack
• Princess Mononoke (1997)
  (Dual-audio, English+Japanese)
  Screencap | Soundtrack
• My Neighbours the Yamadas (1999)
  (In Japanese only. Includes hard-coded English subtitles.)
  Screencap | Soundtrack
• Spirited Away (2001)
  Screencap | Soundtrack
• The Cat Returns (2002)
  Screencap | Soundtrack
• Howl’s Moving Castle (2004)
  (Dual-audio, English+Japanese.)
  Screencap | Soundtrack
• Tales from Earthsea (2006)
  Screencap | Soundtrack
• Ponyo (2008)
  Screencap | Soundtrack
• Arrietty (2010)
  (In Japanese only.)
  Screencap | English Subtitles | Soundtrack

Short films (All in Japanese):

• Ghiblies Ep. 1 (2000)
  (Includes hard-coded English subs.)
  Screencap
  Ghiblies Ep. 2 (2002)
  (Includes soft-coded English subs.)
  Screencap
• The Night of Taneyamagahara (2006)
  (Includes soft-coded English and Japanese subs.)
  Screencap
• Iblard Jikan (2007)
  (Silent film.)
  Screencap | Soundtrack

Notes:
-All feature films are in English (unless stated otherwise).
-For a quality sample of each video click the screencap link below the title. They have not been edited or resized.
-All Soundtracks are in MP3 format, and are contained in individual zip folders.

• Subtitles:
  To use a subtitle file, keep both the movie file and the subtitle file in the same folder. When you play the movie your media player should automatically play the subtitles with it. If not, open the movie file first, and then open the subtitle file in the same media player.
  
  -To open/change a subtitle file in VLC: go to Video > Subtitles Track (the same goes if you want to disable the file).
  -To open/change a subtitle file in The KMPlayer: right click, select Subtitles > Subtitle Languages. If you want to disable subtitles select “Show/Hide Subtitle”.
  
  
• Dual/multi-audio:
  -To select your preferred language in VLC: go to Audio > Audio Track.
  -To select your preferred language in The KMPlayer: right click, select Audio > Stream Selection.

I’ve seen all of them except Only Yesterday, Ocean Waves, Pom Poko, Whisper of the Heart, and Tales from Earthsea. Must see them. :3