Sadly, most of these sites are long gone, but I will leave the links here for historical purposes.

House Silvergate: Gemstone III
The origin of PIF (Still operating in GemStone today, no longer in AC2)
 

Silvergate: Asheron's Call 1
Kailef's AC1 guild site
(Unfortunately no longer in existence)
 

Pay It Forward: Asheron's Call 2
Monsterbait's PIF forum (The original PIF guild site / forum)
Username: pif  Password: pif
(Unfortunately no longer in existence)
 

Pay It Forward Asheron's Call 2
Kailef's PIF guild site, includes a link to the 2nd generation PIF forums
(Unfortunately no longer in existence)
 

Pay It Forward: World of Warcraft
Kailef's retired Teemz forum (served while the current site was being built)
(Unfortunately no longer in existence)