Just a quick note to let you know I have a working list of PLigg sites and also 3 lists in one: Scuttle, PLigg and PHPDug.

PHP Dug sites with captcha

http://www.webmaster911.com/signup.php

http://www.sticky4um.com/signup.php

http://www.entereu.org/signup.php

http://turputevka.com/signup.php

http://www.we-need-money-not-art.com/digg/signup.php

http://www.easymash.com/signup.php

http://www.apiss.org/signup.php

http://socialogs.com/signup.php

#captcha

http://wiiaredrunk.com/ #
http://www.gogurl.com/signup.php #
http://www.savetheplanet.ca/ #
http://th3scoop.com/ #
http://onlinegameszone.com/ #
http://www.twincitiesbookstores.com/signup.php #
http://guitag.com/ #
http://www.wahacz.pl/register #
http://www.ludicrous.net/signup.php #
http://www.laflink.com/signup.php #
http://www.directoryarchives.org/signup.php #
http://www.imscuttle.com/signup.php #
http://www.entereu.org/signup.php #
http://www.newits.net/signup.php #
http://www.oopza.com/signup.php #
http://www.knowsociety.com/signup.php #
http://www.adusum.org/ #
http://www.bookfizz.com/signup.php #Recaptcha
http://bio-network.org/signup.php #

http://www.fsbo-ads.com/signup.php

http://www.sharingit.co.uk/signup.php #
http://www.fashionablylatent.com/signup.php #
http://www.mimeetings.com/signup.php #
http://www.ludicrous.net/signup.php #
http://www.latestramblings.com/signup.php #
http://www.droolage.com/signup.php #
http://www.internettycoon.nl/socialbookmarkingsite/signup.php #
http://www.pressonweb.com/signup.php #
http://trendy.myphillynetwork.com/signup.php #
http://www.buzzingtopics.com/signup.php #
http://www.oneremix.com/signup.php #
http://www.politigg.co.uk/signup.php #recaptcha

Scuttle Captcha

http://www.mexoseopol.pl/register.php/

http://www.soxan.pl/register.php/

http://zakladki.tumus.com/register.php/

http://alltagz.marketing-boerse.de/register

http://bookmarks.beste-in.de/register/

http://ho.tli.st/register

http://klikz.ru/register.php/

http://linkjeim.info/register.php/

http://my.2net.co.il/register.php/

http://url.org/signup/

http://pryggs.com/register.php/

http://www.fliplanet.com/register.php/

http://www.biginternetdirectory.com/register.php/

http://www.bildu.net/register/

http://www.kantauri.com/bookmarks/register/

http://www.technopolia.pl/newuser.php

http://www.zakladka.eu/register.php/

http://www.bildu.net/register/

Name of this application Captcha

http://cyberfolio.recitmst.qc.ca/recherche/register.php/

http://distance.ktu.lt/scuttle/register.php/

http://effraie.org/bookmarks/register/

http://festic.fr/semanticscuttle/demo/fr/register.php/

http://paidresearch.info/register/

http://recit.qc.ca/ressources/register.php/

http://recitmst.qc.ca/ressources/register/

http://scuttle.infonautica.net/register.php/

http://semantice.planete-education.com/register.php

http://syosai.skanu.net/register.php/

http://wallmaniak.com/register.php/

http://wert.antik-kuenste.de/register.php/

http://distance.ktu.lt/scuttle/register.php/

http://www.s-tyneside.net/bookmarks/register.php/

http://www.dhajoint.com/register.php/

http://www.zafire.co.za/

http://www.communitysuchmaschine.de/register

http://www.dhajoint.com/register.php/

http://www.katalogiseo.info/scuttle/register/

http://www.mytagz.de/register.php/

OTHER CAPTCHAS

http://flash-clip.net/register.php

http://gebookt.de/anmelden.php/

http://socialmarker.co.cc/register.php/

http://www.bookstars.de/registrieren

http://www.fliplanet.com/register.php/

http://www.gebookt.de/anmelden.php/

http://www.inzy.de/register.php/

http://www.linkagent.eu/

http://www.mshare.de/register.php/

http://www.net-officers.de/jaichwill.php/

http://www.ojo.ms/register/

http://www.pedagoglankar.se/regga.php

http://www.pixel-screen.de/register/

http://www.projet-civ.com/annuaire/register.php

http://www.recitfga-bsl.info/signet/register.php/

http://www.reise-bookmarks.de/register.php/

http://www.ros-ing.com/register.php/

http://www.sharinglinks.com/register/

http://www.sociopole.cnrs.fr/register

http://www.suosikit.fi/register.php