[Rohanna]

This is an informative post, so responses will be deleted (after being reviewed for addition to the first post)

People who are online regularly, and put in a fair amount of effort at having a "complete book" of patterns in guild will be listed here. If you're looking for a rare pattern, especially a raid pattern, these would be the people to touch base with.

Jewelcrafting
Serror (Rohanna), Shardik, Wrathblood, Hecatus

Tailoring - PMC - Primal Mooncloth, ShC - Shadowcloth, SC - Spellcloth
Tranela (aka Rohanna) [ShC], Len [PMC], Hecatus [PMC]

Leatherworking
Shardik

Blacksmithing
Serror (Rohanna), Risika

Engineering
Forte, Wrathblood

Alchemy - EM - Elixir Mastery, PM - Potion Mastery, TM - Transmute Mastery
Rohanna [EM], Dornak [PM], Wrathblood [TM], Nialla (aka Len) [TM], Forte [EM], Bearforceone [EM]

Enchanting
Rystorm, Len, Bielek (Bearforce)

Inscription
Adalicia (Rohanna), Forte, Bielek (Bearforce), Tift