The JTAG HACK:

There is a new hack which can boot homebrew code in less than 5 seconds. See
at the end of this document for a description how the hack works. For now,
all we need to know is that this is a new way to exploit the well-known 4532
kernel, in a way which also works on updated machines, unless they have been
updated by the summer '09 update. It also works on all hardware types.

This document is a technical description meant for people who want to
undestand the hack. If you don't understand a word, calm down - there
probably will be future releaes, howtos etc.

Please also notice that from a functional side, the result will be the same
as the KK-hack; it's just must faster, works on more hardware and is more
reliable. So it replaces the KK-hack, not less and not more.