This site contains all the latest information I have gathered from Studio Gobli.
I do not take any credit for all of the formulas and knowledge base since all I do is mostly just translate them into English
There might be a little information I added that is not available on studio gobli.

Update :

April 14th, 2007 Added inf o about fSTR(2) lower cap and the occurence when the cap will happen
I've also updated the wiki regarding this. Thanks to JP FFXI wiki
Feb 10th, 2007 I've seen some interesting stuff lately, but too lazy to put in here, so here's few I can recall
  • Physical WS damage calculation : After being multiplied by fTP, the base damage should be truncated (see definition of base damage).
  • My Blue Magic Notes : It seems that the fSTR and fSTR2 of Blue Magic does not have a cap.
  • Physical Damage calculation : Triple damage proc of Mandau does not affect the DEX and AGI bonus during Sneak Attack / Trick Attack activation. (see Misc. section)
  • Physical Damage Calculation : n-fold damage in Relic Weapons in General (see Misc. section)
  • Physical Damage Calculation : Jump damage calculation (see Misc. section)
    		•
    Dec 23rd, 2006 As Requested by Gulkeeva,
  • Added Blue Magic Notes.
  • Added Mind Blast and Magic Hammer info on Blue magic page.
    Check the magical blue spell section
  • Added info in Metatron Torment.
    		•
    Dec 6th, 2006
  • Added Thoughts/ FAQ page
    I hope this page can help answer all the common non-trivial answers :) Enjoy!
    		•
    Aug 29th, 2006
  • Blue Magic page updated:
    Complete update of BLU physical spell damage type
    Frenetic Rip 2H multiplier
    Hysteric Barrage and Ram Charge 2H multiplier still unsure
    BLU Skill 291 → D67 confirmed
    Saline Coat Magic def up info
    Updated: Sound Blast info
    Updated: Venom Shell info
    Updated: Stinking Gas info
    Updated: Awful Eye info
    Updated: Confirmed defense down from Frightful Roar (it's similar to Dia II's)
    Added Cold wave info
    Updated: Enervation defense down info
  • Updated Eviscreation info : TP Multiplier and deleted wrong info on "Attack Radius"
  • Added info on Red Lotus Blade
  • Moved Starlight and Moonlight to Magical Based WS
  • Added 300TP Multiplier info for Howling Fist
  • Changed Scourge info about "Critical hit rate is insignificant" to "significant"
    		•
    Aug 21st, 2006
  • Slight update on Blue Magic Page:
  • SC Properties of ranged physical blue magic is confirmed
  • Added TP detail on Hysteric Barage, Cannonball, and Ram Charge
    • Aug 21st, 2006
  • Changed 2 things, Thanks to SirEaglestrike
  • First one is changed the example for fTP of multi hit WS (PDIF=1.0 to fTP=1.0)
  • Second is changed the note of coronach (Insignificant → rather significant)
    • Aug 10th, 2006
  • Changed Cross Reaper WSC from STR_30%, INT_30% to STR_30%, MND_30%
    • Aug 10th, 2006
  • Changed Tachi: Kaiten Properties to Light/Fragmentation instead of Light/Distortion
    • Aug 8th, 2006
  • Took out the "Sleep effect + Poison" from Mercy Stroke. Thanks for the information Ichthyos
  • Poison from Mandau is suppose to be 10HP/ 3 seconds instead of 10HP/ second.
  • TP modifer from True Strike is changed from Critical Hit Rate to Accuracy. Thanks for pointing that Ilean

    • Full update history is over here