Burials index for most (not all) parishes are on Brian Lawson's website at http://www.lawsons.ca/burials/bur_indx.html
Bapt and marriage indexes on IGI at http://www.familysearch.org/Eng/Search/frameset_search.asp
Some entries will be "extracted" - meaning transcribed from the parish register, which are generally accurate although sometimes mis-spelled. Others are "Record submitted" by someone, which might be replacing a parish register entry, but are often invented to fill a gap in someone's tree, and are best avoided.
Look for Source Call No. at the bottom of the screen below an extracted entry - that is the LDS film number for the entry. Click on that and it will show you everything that film contains.

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