Hack your Canon P&S camera

I was reading this article which tells you how to "hack" your Canon point and shoot camera. It covers these models: A450
A460
A530
A540
A550
A560
A570
A610
A620
A630
A640
A650 IS
A700
A710 IS
A720 IS
S2 IS
S3 IS
S5 IS
G7
SD450 (IXUS55)
SD500 (IXUS700)
SD630 (IXUS65)
SD700 (IXUS800)
SD800 (IXUS850)
SD850 (IXUS950)
SD870 (IXUS860)
SD1000 (IXUS70)
TX-1

It looks really complicated to me but could be lots of fun for a geeky gadgety camera person!