I love Stephen King's LONG books. Reading a LONG book really helps with the feeling of despair I get when I'm nearing the end of a book I love.
I read Knitting Without Tears today, and in it she mentioned having the same pains when finishing a knitted garment - she falls in love with it and doesn't want it to end. So she draws out the finishing process.
That's exactly what I did with my book. The last hundred pages took me as long as the previous three hundred. I drew it out, but it's over now. Time to move on.