Wow, that's really good to know! The last time I did the JMT I mailed street clothes and stuff to the motel I was planning to stay at, but with the Portal Store as a possible destination I can be a lot more flexible. Also, I can hitchike down to Lone Pine with a huge box under my arm .... hmmmm... tradeoffs...
Does anybody know of a UPS shipping point in or near Yosemite Valley? [You can see the wheels turning, here...]