Love Letters isn't a typical stage production by the standards of contemporary acting. That's because it's not necessary for performers to act or even memorize A.R. Gurney's script; they just read it. The experience is a bit like listening to a book-on-tape, with the benefit of being able to watch the readers. Some audience members for Playcrafters Barn Theatre's current production - running weekends through January 26 - won't enjoy the lack of stage movement, but those who know what to expect beforehand will appreciate the well-written script.