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The language indicated above the subtitle sites is the language the site is in, not just the subtitles it provides.

Various Languages
http://metasubs.com/ (search engine) [此搜索引擎超酷]
http://subtitles.images.o2.cz/
http://www.opensubtitles.org/
http://www.podnapisi.net/
http://www.7nights.net/
http://www.tvsubtitles.net/ (tv series only)
http://www.forom.com/ (tv series only, must register + annoying popups)

Bosnian, Croatian & Serbian
http://www.prijevodi-online.org/
http://www.divx-titlovi.com
http://www.podnapisi.net

Bulgarian
http://subs.unacs.bg/

Chinese
http://www.shooter.com.cn/

Danish
http://www.danishsubscene.org/

Dutch
http://www.nlondertitels.com/
http://www.ondertitel.com/
http://www.subtitlesnl.com/

English
http://www.subtitles.cz/en/ (must register)
http://www.divxsubtitles.net/
http://subscene.com/
http://www.subtitlesbox.com/ (must register)
http://www.kloofy.net (must register - excellent for asian subs)
http://www.desisubs.com/ (excellent for hindi subs)
http://www.hot.ee/subland/ (popups!)
http://divxstation.com/subtitles.asp
http://titles.box.sk/
http://www.subdb.net/
http://www.moviesubtitles.net/
http://www.subbiee.com/
http://www.mooveez.net/
http://subs.motechnet.com/ (english & swedish subtitles only)
http://titulkykserialum.net/en/ (tv series)
http://www.mysubtitles.com/
http://wikisubtitles.net/

Estonian
http://subclub.future.ee/

French
http://v2.frigorifix.com/
http://www.subthermix.be/
http://www.calorifix.net/ (asian movies)
http://www.sub-way.fr/
http://www.seriessub.com/ (tv series)
http://www.series-vo.com/ (tv series)
http://victoire.b.free.fr/VO.ST.FR./
http://davidbillemont5.free.fr/

German
http://www.subtitles.de/

Greek
http://www.greektvsubs.gr/
http://www.greeksubs.com/
http://www.dvdstuff.gr/
http://subs4u.gr/
http://www.movieplace.gr/
http://www.insomnia.gr/vb3/search_subtitles.php

Hebrew
http://www.tapuz.co.il/
http://www.torec.net/
http://www.donkey.co.il/
http://www.nfoil.com/
http://hebsub.tk/
http://www.subs-il.com/

Hungarian
http://www.feliratok.hu
http://www.janosekweb.com/hosszupuska/

Polish
http://kinomania.org
http://napisy.info
http://www.napisy24.pl
http://hatak.pl

Portuguese
http://www.central-subtitles.com/
http://www.legendasdivx.com/

Portuguese Brazilian
http://www.legendas.tv/
http://www.legendando.com.br/
http://www.legendasdivx.com/
http://www.sobaixarlegendas.com.br/
http://www.central-subtitles.com/
http://www.soseries.tv/ (tv series)

Romanian
http://subtitrari.softpedia.com/
http://www.mysubtitles.ro/
http://subtitrari.regielive.ro/
http://www.subtitrari.com/

Russian
http://www.subtitry.ru/
http://subs.com.ru/

Spanish
http://www.subdivx.com/
http://buscador.argenteam.net
http://www.grupoutopia.com.ar/main.html
http://www.solosubtitulos.com/
http://vo.tusseries.com/ (tv series only, must register)
http://www.asia-team.tv/ (all sorts of movies [not only Asian]); must register)
http://www.asia-team.net/ (movies/TV series/Anime with focus on Asian productions; must register)

Swedish
http://www.undertexter.se/

Turkish
http://www.divxplanet.com/
http://www.foreverdivx.com/

Subtitle Players
BSPlayer
VLC Media Player

Subtitle Software
SubRip SubRip allows you to rip subtitles from your DVDs.
SUBmax is a subtitle editor, manipulator, adjuster, player.
Subtitle Tool is a program for editing, time shifting, speed changing, joining, spliting and checking subtitles.
WinSubMax adds subtitles to your SVCD's.
Subtitle Workshop is a subtitle editing tool.
Time Adjuster is another subtitle editing tool.

Guides
Add subs to SVCD with Virtual Dub tutorial - a similar guide w/different tools
Convert DivX to VCD with subtitles - for more advanced users
OGG / OGM movies to VCD or SVCD using Graphedit - burning .ogm/.ogg files to VCD/SVCD

Getting subtitles to play.
You should keep your movie and your subtitles both in the SAME folder, a lot of the times your media player will pick up the subtitles (otherwise you have to go to the subtitle options in your media player and select the subtitle files manually).

An alternate method to playing subtitles is DirectVobSub. Once you install this application all you have to do is make sure the filename of the movie and the name of the subtitle file are the same (except for the extension of course).

Note: if you can't find the subtitle file that exactly matches the movie file, it will save you some work to download a subtitle that uses the same frame rate as the movie. You can then use SubMax or Subtitle Tool to get the subtitles in sync with the movie.