Puppy 2.16.1 is a minor bugfix upgrade of 2.16. If you already have 2.16, no problem, the bugs probably will not affect you. To find out what the bugs are, read my Developer News blog: http://www.puppylinux.com/news/ and scroll down to the posts titled: "Multisession CD/DVD, unable to delete desktop icons" "Bugfix for USB installations" ...so, these bugs affect you if you either install Puppy to a USB drive or run a multisession-CD (saving sessions back to the CD/DVD). Note for 2.16 users, GuestToo has prepared a Service Pack with one of these bugfixes, the other coming soon (I'm writing this on 24 May 07): http://www.murga-linux.com/puppy/viewtopic.php?t=18361