Originally Posted by RWood
In short, IMHO, once you have the book corrected and proofed, the rest is easy.
If you're really lucky you might be able to find more than one source file for a book - then you can run text comparisons which can highlight problems in the texts.
Most sites, though, will just have the PG version - and hence the same errors as the PG file. Finding more than one independent source isn't always possible - but it can save a lot of effort if you do, so worth trying imho.