I loved Gamecube! So many awesome multi-player memories.
Here's my current collection:
Games:
I have every first-party game released in the US and Japan.

I'm pretty sure I have every 3rd-party game I want for GC at this point as I seem to have bought most multi-platform games (Alien Hominid, Prince of Persia series, Mega Man collections, etc.) for PS2.
On an interesting note, Pac Man Vs/Pac Man World 2 is the
only Greatest Hits/Player's Choice game I own from the GC/PS2/XBOX era.
For anyone curious, the import games are:
Battle Stadium D.O.N.
Dream Mix TV World Fighters
Donkey Konga (has a few different songs than the US release)
Donkey Konga 2 (^ ditto)
Donkey Konga 3 (JP-exclusive)
Giftpia
Kururin Squash!
Kyojin no Doshin
Nintendo Puzzle Collection
Mr. Driller Drill Land
PC Genjin
Takahashi Meijin No Boukenjima
Dragon Drive D-Masters Shot
Densetsu no Quiz Ouketteisen (above Dragon Drive)
(the US games obscured by my shelf are 1080 Avalanche, Mario Party 4 & 5, Sonic Heroes, & Sonic Riders)
Demos/Misc:
Controllers:

I found these Club Nintendo exclusive controllers for ~$20 a pop when I lived in Japan.
There were 3 additional CN controllers released (a Luigi wired controller, a dual-tone CN controller, and a CN Wavebird) but I never came across any of them unfortunately.

They're not pictured but I also have 4 pairs of Donkey Konga Bongos, the Odama microphone, and the DDR Mario Mix pad tucked away in my Game Room closet.
Consoles:

My launch GC (with GB Player & official Component Cables) is still going strong and I got the Panasonic Q during my time in Japan.
I also used to have the Japanese LE Metal Gear Solid Gamecube, complete-in-box with both Metal Gear discs, which I found at a used game store in Japan for 3980円(!!).
I paired it with an Official (Japanese) Component Cable (also CIB) I found for 1200円 and got $475 for the set on eBay a few years ago!
