Its funny, with the S2 DirecTivo, TiVo recently figured out they left the back door in, they took it out in the latest software release. So to hack it you have to put the previous kernel back on. Then it uses a MIPS processor instead of a PPC one, so in hacking it you have to make sure that the files are compiled for MIPS. My next hack on my Series 1 Stand alone will be to increase my drive capacity, using the Lba48 kernel hack. Not sure on the size though... 600GB in my Tivo enough?