Smoku, this is my step:

I download the file kernel-2.6.28+joydev+mousedev.tar.bz2

I copied the *.ko to /lib/modules/2.6.28-omap1/ [OK]
and i use the zImage to flasher-3.5 for flashing N900 [OK]

I JUMP the scratchbox step [NO]

I get the Bluetooth Address of N900 with command HCICONFIG [OK]
Instead using sixpair to insert into Sixaxis my N900 Bluetooth Address, i use SlovePie 0.30 with sixpair.pie that works the same way. [OK]
I download the compiled SIXAXISD for N900 posted by you and copied into /usr/bin [OK]
I update the permission to sixaxisd with CHMOD 777 SIXAXISD [OK]
And i run SIXAXISD... Listening for connection [OK]
I Press PS button to Sixaxis [OK]
Appear the message to N900 (5 - 6 time) for connect Playstation(R) 3 Controller Yes or No, i click to OK but the connection not enstablished [NO]

Why? I wait your complete guide!