The guys who started it all...well, after they bought up TSR, who gave us the wonderful little game called Dungeons & Dragons.  Besides the core rulebooks, these are also playable tomes in Lorenvale: Manual of the Planes, Deities & Demigods, Sword & Fist, Tome & Blood, Defenders of the Faith, Song & Silence, Masters of the Wild, Monster Manual II, Fiend Folio, Epic Level Handbook, Psionics Handbook, Oriental Adventures, Stronghold Builder's Handbook, Forgotten Realms Campaign Setting, Magic of Faerûn.

I should work for these guys.  No sooner did I think I had an original idea than AEG printed it.  Publications by AEG that are playable in Lorenvale: Mercenaries, Magic.

The Scarred Lands campaign setting is great!  I haven't actually used the material as a separate world--my plans are to populate some other continent of Oerth with this setting, but that hasn't happened just yet.  Publications by Sword & Sorcery that are playable in Lorenvale: Relics & Rituals (I & II), Creature Collection (I, II & III).

In our humble estimation, quite possibly the best producers of fantasy miniatures available...period.  We shop nowhere else, and have yet to play a character without a suitable figurine representing him.

Mr. Cook fascinates me with his amazing imagination.  Not only was he instrumental in designing a whole new version of D&D, but then he up and crafts his own set of rules.  Amazing.  We don't use any of his books, though.

Just the right folks for designing a niche product that addresses a specific need.  Publications by Bastion Press that are playable in Lorenvale: Alchemy & Herbalists, Pale Designs: A Poisoner's Handbook.

Another wonderful niche producer, and another group that I could work for.  Publications by Fantasy Flight Games that are playable in Lorenvale: Spells & Spellcraft, Traps & Treachery (I & II).