How to Recover From Accidental Deletes ?

Hi ,

I have been trying to look at ways to recover from any accidental deletes.
Reading some pevious posts , its clear that its possible since the 
records are
just marked for delete and not actually deleted. Its deleted only after 
a Vacuum
command is run .

I believe its possible to talk to backent and read the data in the form 
of raw
tuples . Any one know how its done ? or any docs that talk about such stuff.

thanks in advance,
Anthony