old script problems to run!

i get the following errors

so what can be done to correct this and ahve it run again in 626

File " nenuexamp3.py", line
05, in register
AttributeError: bpy.types.register(…): already registered as a subclass.


Blender 2.53 does registering van classes automatically.
Make a ‘camouflage’
put a # before the “register command”

how come it does not give errors in other scripts
we still see theses registers unregis lines in latest script like torus and knots ect…

is there a list somwhere of API changes since 3 weeks
that we can look at and check

hope it stabilise soon !