I think the source should be -
raphael’s devblog » Blog Archive » JoySens 1.01 - working for 3.40 OE and up!
A download link would be useful too. BTW, the author says it works fine with all custom firmwares (OE and M33) 3.40 and upwards.
But this looks really useful - especially to those who have had problems with their analog sticks! Nice job, raphael!