I heart instrumentals.
Here's a list of some of my faves, organized first by band alphabetically, then by album chronologically, then by order of songs appearance on each album.
Alice in Chains- Whale & Wasp
Annihilator- Crystal Ann
Anthrax- Across the River
Black Sabbath- Bassically
Black Sabbath- Rat Salad
Black Sabbath- Orchid
Black Sabbath- Laguna Sunrise
Black Sabbath- Don't Start (Too Late)
Cannibal Corpse- From Skin to Liquid
Cynic- Textures
Dark Angel- Cauterization
Death- Cosmic Sea
Death- Voice of the Soul
Death Angel- The Ultra-Violence
Death Angel- IPFS
Exodus- 30 Seconds
Fates Warning- The Ivory Gate of Dreams: I. Innocence
Fates Warning- The Ivory Gate of Dreams: VIII. Retrospect
Forbidden- Parting of the Ways
Iron Maiden- The Ides of March
Megadeth- Good Mourning
Megadeth- Into the Lungs of Hell
Metal Church- Merciless Onslaught
Metallica- To Live is to Die
Morbid Angel- Doomsday Celebration
Morbid Angel- Desolate Ways
Morbid Angel- Disturbance in the Great Slumber
Morbid Angel- Hymn to a Gas Giant
Morbid Angel- Ascent Through the Spheres
Morbid Angel- Drum Check
Morbid Angel- Memories of the Past
Nasty Savage- ?
Necrophagia- Season of the Dead
Pink Floyd- Any Colour You Like
Pink Floyd- On the Run
Pink Floyd- The Great Gig in the Sky
Possessed- Intro
Sepultura- Inquisiton Symphony
Stone Temple Pilots- No Memory
My absolute favorite instrumental is Atheist's Samba Briza, although my favorite changes frequently.