Last fall I saved the pits from some peaches and plums to see if I could get them to grow. For those fruits you have to 'stratify' the seeds in the refrigerator for several months in order to get the seeds to sprout. I just checked on them a week or so ago, and low and behold they were sprouting! I've since moved them to the windowsill and they are 3-4 inches tall already. Once they get big enough I'm hoping to harden them off and plant them outside.