Yup...I agree.
CCleaner is the best choice to clear your
registry.
There are also many other programs out there
but you need to be carefull about what you
delete in your registry. If you don't have
that huge knowledge, ccleaner is the best
option to clean it and make your system
a little bit faster.
CCleaner also gives you an option to
make a backup of your registry. If you
do something wrong or delete wrong
entries, you always have a way to 'undo'
your steps in there.
I'm using ccleaner since one year and
never had a problem wit that.
Rayden