For me, 2005 brought 2 absolutely amazing albums that you wont see me without.

Wobbler - Hinterland
Machine And The Synergetic Nuts - Leap Second Neutral

The Wobbler album is an excellent album much in the vain of Anglagard or King Crimson.

The MATSN album is an amazing jazz-fusion album very similar to Soft Machine's output after 'Third'.

Any albums I'm missing out on?

Speaking of Soft Machine: The Soft Machine Legacy Live in Zaandam (2005) is a GREAT album!!
The group includes Elton Dean, Hugh Hopper, John Etheridge and John Marshall. Heavy guitar and crazy sax from former members of SM who never actually played at the same time together.
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Album of the year for me (and winning by a mile) is Deadwing by Porcupine Tree

Other great releases in no particular order include:
Opeth Ghost Reveries
Kate Bush Aeriel
Oceansize Everyone Into Position
Amplifier The Astronaut Dismantles HAL
System Of A Down Mezmerize/Hypnotize
Pure Reason Revolution Cautionary Tales for the Brave
Pineapple Thief 10 Stories Down
Martin Grech Unholy
The Mars Volta Frances The Mute
A-ha Analogue
Mew Mew And The Glass Handed Kites
Dream Theater Octavarium
Institute Distort Yourself
Cave In Perfect Pitch Black
Spock's Beard Octane
Sigur Ros Takk…
Kino Picture
King's X Ogre Tones
Audioslave Out of Exile
Coheed And Cambria Good Apollo I'm Burning Star IV

also
Rush R30
Yes The Word Is Live
Marillion Marbles By The Sea
Marillion Popular Music

I think some honourable mention should go to all the great
Remasters of 2005.  

Most notably the Steve Hackett and Gentle Giant 35th Anniversary Remasters.

The sound of the latter are particularly stunning...esp. The Power and the Glory and Freehand!

:)