In Judy Martin's newest Log Cabin book, she recommends cutting on the lengthwise grain of fabric to prevent stretching. On small blocks, that might not make much of a difference, but I can see where it would help on larger ones.
You can stack your fabrics and cut four layers of strips at once. She also cuts each rectangle size at that time and puts them in silverware sorters. (Instead of piecing and trimming to size at a later time, if that makes sense). Someone here made a beautiful log cabin last summer and posted a picture of her sorted pieces, too.