Here are root nodes for every voting/XP thread I turned up.

Catagorized votes		ivory		Jul 28 2000
To better discern when to vote		cbraga		Jul 28 2000
Prevent votes on anonymous posts		ybiC		Jul 16 2000
Voting guidelines		zdog		Jul 5 2000
Why do you vote like you do?		ybiC		Jul 2 2000
Thoughts on voting and reputations		ahunter		Jun 14 2000
Abusive negative voting		buzzcutbuddha		Jun 9 2000
Votes & reputation		Kozz		May 20 2000
Scalability of the voting system		httptech		May 9 2000
Voting		ccilla		May 02 2000
Should Perl gurus receive mega XP?		vroom		Apr 27 2000
Experience system		plaid		Apr 26 2000
Beginnings of the voting experience system		vroom		Mar 23 2000

No doubt I missed a couple.
    cheers,
    ybiC