Sadly, a number of albums at the bottom don't have release dates and/or were released in 2003 on some sites (but others have 2002, so I'm going with those).
Very good year, and deep year.
Notably, a lot of debut albums that came out for artists that would go on to make great work in the following years.
Also many albums from artists that I consider their best work (Sigur Ros, Peter Gabriel, etc).
And of course many of these I know of, or only listened to a few times, or it has been a long time since I listened to them.
And of course there very well could be many titles to add, which maybe I'll bump this is if I do discover them, etc.
1. dredg - El Cielo
2. Pain of Salvation - Remedy Lane
3. Call Florence Pow - The Strange Situation
4. Dream Theater - Six Degrees of Inner Turbulence
5. Archive - You All Look the Same to Me
6. Ours - Precious
7. Sigur Rós - ()
8. Shaman - Ritual
9. Broken Social Scene - You Forgot It in People
10. Clann Zú - Rua
11. Murder By Death - Like the Exorcist, but More Breakdancing
12. Porcupine Tree - In Abesntia
13. Three - Half Life
14. Pat Metheny - Speaking of Now
15. Opeth - Deliverance
16. Silverchair - Diorama
17. Weather Report - Live and Unreleased
18. Spock's Beard - Snow
19. Kevin Gilbert - The Kaviar Sessions
20. Peter Gabriel - Up
21. Anathallo - Sparrows
22. Superior - Ultima Ratio
23. David Bowie - Heathen
24. The Mars Volta - Tremulant [EP]
25. The Decemberists - Castaways and Cutouts
26. Do Make Say Think - And Yet And Yet
27. SikTh - How May I Help You?
28. Doves - The Last Broadcast
29. Enchant - Blink of an Eye
30. Agalloch - The Mantle
31. Godspeed You Black Emperor - Yanqui U.X.O.

Pain of Salvation - Remedy Lane
rel January 15th, 2002

Fair to Midland - The Carbon Copy Silver Lining
rel January 25th, 2002

Dream Theater - Six Degrees of Inner Turbulence
rel January 29th, 2002

Pat Metheny - Speaking of Now
rel February 12th, 2002

Bela Fleck and the Flecktones - Live at the Quick
rel February 26th, 2002

Coheed and Cambria - The Second Stage Turbine Blade
rel March 5th, 2002

Biffy Clyro - Blackened Sky
rel March 10th, 2002

Archive - You All Look the Same to Me
rel March 12th, 2002

Do Make Say Think - And Yet And Yet
rel March 18th, 2002

The Jelly Jam - The Jelly Jam
rel March 18th, 2002

The Velvet Teen - Out of the Fierce Parade
rel March 19th, 2002

XTC - Coat of Many Cupboards
rel March 25, 2002

Silverchair - Diorama
rel March 31st, 2002

The Apex Theory - Topsy-Turvy
rel April 2nd, 2002

The Mars Volta - Tremulant [EP]
rel April 2nd, 2002

Doves - The Last Broadcast
rel April 29th, 2002

Between the Buried and Me - Between the Buried and Me
rel April 30th, 2002

The Polyphonic Spree - The Beginning Stages Of...
rel May 2nd, 2002

Superior - Ultima Ratio
rel May 7th, 2002

Rush - Vapor Trails
rel May 14th, 2002

The Decemberists - Castaways and Cutouts
rel May 21st, 2002

Mastodon - Remission
rel May 28th, 2002

Frou Frou - Details
rel June 4th, 2002

David Bowie - Heathen
rel June 11th, 2002

Murder By Death - Like the Exorcist, but More Breakdancing
rel June 25th, 2002

Echolyn - Mei
rel June 2002

Dark Tranquillity - Damage Done
rel July 22nd, 2002

Enchant - Blink of an Eye
rel July 23rd, 2002

Bend Sinister - The Warped Pane
rel August 1st, 2002

Shaman - Ritual
rel August 2nd, 2002

Agalloch - The Mantle
rel August 13th, 2002

Nile - In Their Darkened Shrines
rel August 20, 2002

Coldplay - A Rush of Blood to the Head
rel August 26, 2002

Spock's Beard - Snow
rel August 27, 2002

Minus the Bear - Bands Like It When You Yell "Yar!" at Them [EP]
rel September 16th, 2002

Peter Gabriel - Up
rel September 23rd, 2002

SikTh - How May I Help You?
rel September 23, 2002

Beck - Sea Change
rel September 24th, 2002

Porcupine Tree - In Absentia
rel September 24th, 2002

Weather Report - Live and Unreleased
rel October 1st, 2002

dredg - El Cielo
rel October 8th, 2002

Broken Social Scene - You Forgot It in People
rel October 15th, 2002

Proto-Kaw - Early Recordings from Kansas 1971-1973
rel October 21st, 2002

Sigur Rós - ()
rel October 28th, 2002

Godspeed You Black Emperor - Yanqui U.X.O.
rel November 4th, 2002

Opeth - Deliverance
rel November 4th, 2002

Ours - Precious
rel November 5th, 2002

Joey Eppard - Been to the Future
rel December 3rd, 2002

Three - Half Life
rel December 17th, 2002

Anathallo - Sparrows
rel 2002
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Call Florence Pow - The Strange Situation [EP]
rel 2002

Clann Zú - Rua
rel 2002

Kevin Gilbert - The Kaviar Sessions
rel 2002

God is an Astronaut - The End of the Beginning
rel 2002

Kaddisfly - Humania [EP]
rel 2002

Lehto and Wright - The Further Adventures of Darling Cody
rel 2002

Menomena - Happiness is Shouting Bingo!
rel 2002