It occurred to me, as i has going through the list of Goodman Games 3x adventures with 1e feel, that I never really played during the 3x era. Instead, I collected and I read.
I have a shitload of 3x WtC sourcebooks - for shit I never played or had any real opportunity to play. My one 3e gaming experience (excluding DDO) was a combat playtest using the Klooge VTT. I did a lot of spending on 3x for a system I never played ;)
My prized possessions though are as follows:
The Necromancer Games release of The Wilderlands - I love that boxed set, even if I may never get a chance to run it. We are pretty set on using the Southland from Points of Light, but the only thing that could change that is a vote for the Wilderlands.
Goodman Games' Castle Whiterock. An excellent megadungeon - I think I burned out my gaming group with Rappan Athuk ;)
Goodman Games' Gazetteer of the Known World - Maybe more then I actually need for a settng, but nearly on par with the Wilderlands as settings go.
Swords & Wizardry Whitebox Boxed Set - I found his as I as finding the OSR. Bought two copies. Gave one away to my to the winner of a round robin AD&D combat scenario with my old (high school and college) gaming group.
And of course boxes of assorted 3x stuff in storage...