Ah my favourite type of thread!
The Comic Relief one was quite a good one for weird odds and sods.
Just some odds and sods, some much rarer than others.... ignoring my favourite foreign language versions

For all those into the Dredd RPG there where loads of extra add ons published in various White Dwarf magazines.
Titan Judge Dredd GN 1 - The colour one "The Streets of Mega-City" and the 10th Anniversary One.
Some of the Titan Hardbacks are now difficult to find as well.
Of the US published comics these are some of the low run ones (I believe!)
Judge Dredd - Black Widow
Judge Dredd - Raptor
Slaine the Berserker - some of the issues had a double heading, e.g. 14/15 and 16/17 I think these where printing errors
The Hanged Man
Finn
Wireheads
Psi-Files
Psi-Judge: Engrams
The Clown - almost impossible to find due to the name!
Zenith Phase 2 - 1 to 3 very difficult to find 3 - Phase 1 1 to 3 not too bad
Flesh the Legend of Shamana - number 4, again not sure this exists or not :-(
Other rare ones:
The non Judge Dredd Poster Progs - I think the Nemesis one was the most difficult to find
Mandarin published Slaine: The Horned God the complete Story
Titan - Zenith Phase 1 (should have been pulped but a few out there)
Black Flame - Judge Dredd 9 - Psykodedden (difficult to get for some reason)
Argon the Savage / Turbo Jones - Pathfinder / Chronos Carnival - take a bit of hunting from the US
Funeral for a Friend
Best of Judge Dredd Special Edition
Judge Dredd - The Oz Odyssey - published in Aus (ok so its foreign!)
Judge Dredd It's Friends, Fans and Foes - book about the fans etc.
Dredd The Law Exhibition Program
Halo Jones the Stage Play Program
Gronk Knitting Pattern - Rob where's mine?!?!?!?!?

Models - Fink Angel and Judge Dredd by Gremlynz - not sure these where produced
Lifesize Head & Shoulders of some of the ABC Warriors - Blackblood and Joe P - I seem to remember also Mean Machine
The unlicensed 15mm Dredd range of metal figures
Virgin Games - Rogue Trooper game from 1990
Fanzines - Friends of Tharg and Class of '79
The 3 (Yellow / Red / Blue) x Judge Dredd Lead Taxi's based from the film - the guy that makes these seems to have disappeared, although his wife was very very ill when I got the last made up one from him.
Dredd & Death Candles
Juve on the Move Backpack
T-Shirts & Hoodies from the ZARJAZ Exhibition (Dec 2005) that Rufus set up. Most of the runs on the T-shirts where either 100, or 50, or 30 or 8!
The full run (18 or maybe 19?) of the 2nd BT Phone Card series from 1997 - I think both sets where limited to a 1000 units.
The set of 4 Nokia 3310 Phone covers - Dredd / Death / Durham Red / Mega-City Punk(?!?!?!)
CD of Judge Dredd The Original Adventures - Series 2 - The Apocalypse War - still can't find this! :-(
CD - The 2 disc version of the Judge Dredd Film Original Score
VHS - 10 years of 2000AD Comic Art Profile - Alan Moore in a 80's Miami Vice White & Blue stripy suit! LMFAO
Every piece of original artwork.
Looking forward to seeing what other goodies are out there!