The project is ongoing, and not all records have been transcribed, but there are more than 270 million records currently available online.
If you have ancestors from England or Wales, Free BMD may help you find birth, marriage, or death records.  Its goal is to transcribe and the UK Civil Registration Indexes from 1837-1992. The project is ongoing, and not all records have been transcribed, but there are more than 270 million records currently available online.