I'll pitch a list in - I'm not sure whether I can rank them, though. So in no particular order:
Grim Tales (Bad Axe)
Tome of Horrors II (Necromancer)
Book of Iron Might (Malhavoc)
The Psychics Handbook (Green Ronin)
Elements of Magic: Revised (EN Publishing)
Honorable Mention: Unearthed Arcana (Wotc), Legacy of the Dragons (Malhavoc)
Top 5 RPG Accessories:
Counter Collection Digital
Counter Collection Gold
Battle Box (all three by Fiery Dragon)
Okay, so I don't have 5 in that category.
Here's a list of cool newish things that I really need to check out soon, again in no particular order:
Ex Machina (GoO)
Conan (Mongoose)
Beyond Countless Doorways (Malhavoc)
Paranoia XP (Mongoose)
HARP (ICE)
Savage Worlds (by ummm... some company)
Gurps 4th (SJ Games)
Ars Magic 5th (Atlas)
The Advanced Beastiary (Green Ronin)
Exalted Player's Guide (White Wolf)
Midnight (FFG)
Arms and Armor 3.5 (Bastion)
Mutants and Masterminds (Green Ronin - I know, I'll get it sometime, I swear)
and Classic Play: Book of the Planes since so many other people mentioned it (Mongoose?)
...and for the obligatory top 5 "looking forward to" list:
Slave Lords of Cydonia (for Grim Tales, by BadAxe)
Arcana Evolved (Malhavoc)
**The Immortals Handbook** (Craig Cochrane aka Upper_Krust - I set this off with stars because I'm really looking forward to it)
Blue Rose (Green Ronin)
Tome of Horrors 3 (Necromancer - because you can never have too many good monsters, and the second one was sooooo good!)
...and maybe Monsternomicon 3.5 (Privateer Press)
Honorable Mentions: other Malhavoc and Green Ronin Advanced line stuff, and probably lots of others.
I think it's clear that I'm an addict.