Surprised I don't have a list of nodes on this topic yet.

• Voting/Experience System
• Why did I get downvoted? by SiteDocClan - May 21, 2002

• Beginnings of the Voting Experience System by vroom - Mar 23, 2000 (PM history: note that XP began on this date)
• Re: Best of the Best Users in Perlmonks site by chromatic - Jan 19, 2006 (... so pioneer monks did not gain any XP for their participation at PM before this date)

• All your Votebots are belong to us by vroom - Aug 08, 2001 (don't use votebots)
• Site Rules Governing User Accounts by SiteDocClan - Mar 23, 2006 (you may have only one account which you use for voting)
• History now influences voting by tye - Nov 18, 2007 (tweaks to the Voting/XP system to mildly discourage some forms of "problematic" voting and, more importantly, to make such "problem voting" matter much less)
• RFC: Policy regarding abuses of the voting system by jdporter - Jun 09, 2022 (further proposed tweaks to the Voting/XP system to discourage massive downvoting of nodes belonging to a specific user)

• Controversial!! - Get rid of the -- vote option. by cnd - Oct 24, 2021

• Just curious: is there a BOT that downvotes "me?" by sundialsvc4 - Jul 14, 2015
• And here's why I think "downvotes" should be eliminated, or tabulated separately ... by sundialsvc4 - Jun 29, 2015
• Can I please have multiple downvotes per (certain monk's) posts. by BrowserUk - May 29, 2015
• -175 := +127 Thank you all! (Updated!Now -152 := +144) by BrowserUk - May 24, 2016 (Buk tries very hard to provoke monks into down-voting him! ;-)

• Quick feedback option for downvotes by Rhandom - Mar 14, 2007
• Optional vote explanation box as an anonymous message sender. by imp - Aug 14, 2006
• Why downvote nodes without commenting on them? by danmcb - Sep 06, 2005
• Reputation: show both up and downvotes by ysth - Aug 09, 2005
• Encouraging comments for downvotes by disciple - Apr 05, 2004
• Downvote for by chromatic - Oct 02, 2004
• Increased number of downvotes at the Monastery? by anonymonk - Mar 10, 2004

• Why do I downvote something? by ibanix - Jan 29, 2003
• Why I Downvote by ignatz - May 15, 2002

• Attack of the Downvote Bots by tadman - Jul 30, 2001
• How I stopped worrying (and learned to love the downvote) by hotyopa - Feb 01, 2001
• Please explain WHY you voted -- by cajun - Feb 14, 2001
• Downvotes with No Comments (Was Re: PlusPlus.pm) by salvadors - Jan 14, 2001
• (kudra: why not downvote?) RE: RE: Crazy like a troll? by kudra - Oct 26, 2000

• Weird anomaly in brian_d_foy experience points by me - Dec 11, 2010

• Upvotes n Downvotes by perlron - Oct 29, 2014 (poem)
• Ode to the Downvoter - Haikus by azatoth - Jun 21, 2001

More nodes were added as they came to my attention long after this node was first posted.