Update: As noted by a number of readers and Tech of the Hub, Netflix hasn't provided captions for 80% of the streaming titles, they've captioned "80% of hours streamed." About half of all titles have captions, but Netflix has focused on the most popular titles first.
Netflix posted an update on captioning, stating that 80% of streaming hours have been captioned.
In mid December, we reached our captioning goal for 2011, when more than 80% of the hours streamed in the US were of content with captions or subtitles available. Thanks to hard work from our captioning team, we made significant strides from 40% in June and 60% in September.
We continue to require captions or subtitles from our providers for all new content where it is available, and we continue to author captions or subtitles for significant new content where it is missing. Our goal is to provide more and more content with captions; however, viewers should expect the gap on the last 20% to narrow more slowly than in 2011, since it includes a large number of titles that are rarely watched, so each hour of captioning added adds less and less to the overall metric.
If you have an older BD player, set-top box or TV you might not get captions because the firmware might not be upgradable.
You can view the list of titles with captions through this link, the link at the bottom of each page on the Netflix site, or by searching for "subtitles."