Here is list of some Social Bookmarking Sites and links can be gained from them easily. Without any cost. Best for SEO purposes. Just make the bookmark public.

www.christianbetancourt.info
www.savongroup.com/scuttle
www.avtz.com
www.buzztagz.com
www.qiel.com
www.szpo.com
www.saveurls.net
www.taxonomies.info
www.sitetags.info
www.linktagger.com
www.ramnathinfotech.com
www.scuttle.misfits.pl
www.soxan.pl
scuttle.sprezarkikompresory.pdg.pl
www.bookmarkingservice.com
www.w610i.pl
tagspot.pl
inf.rawa-maz.pl
www.radioel.legnica.pl
zdrowie.ulubiony.net.pl
www.dwa.e-tam.net.pl
www.cron.olawa.pl
www.partia.browar.bedzin.pl
www.ulubione.inbloom.pl
www.fav-man.de
www.inzy.de
www.rank-raider.de
www.www-link.de
www.multicheck.de
www.bookmarks.meiblog.de
www.wert.antik-kuenste.de
www.tagzswap.de
www.de-firmenlinks.de
www.schnaeppchen-haeppchen.de
www.ruba.de
www.golink.jp
www.tech-system.dk/bookmarks.php
www.bookmarks.ie
www.wside.dk
www.bookmark.domeniuro.ro
www.znatoki.ru
www.html-city.ru
fav.orites.fr
www.addnr.couchtycoon.net
www.bookmarks.zamum.eu
www.promocjastrony.eu
www.my-camping.co.uk
www.link.we-link.co.uk
www.hypo.thalam.us
www.deodry.jp