Sexy No No No is simply one of the most bizarre pop songs ever - but damn it is good!
I also love Call The Shots, Can't Speak French (haha - though it is awful) and Jump.
However as far as current 'girls groups' go I think the Sugababes (while admittedly far more serious than GA) are superior musically. Push The Button, Easy, Overload, Girls, Freak Like Me, Round Round, About You Now, Hole In The Head and Ugly are poptastic.
Now as for Kylie -
The top 10
10. Love At First Sight
09. Hand On My Heart
08. Confide In Me
07. I Should Be So Lucky
06. Made Of Glass
05. In Denial (With the Pet Shop Boys)
04. I Believe In You
03. Wow
02. Cowboy Style
and finally by a huge margin...
01. Put Yourself In My Place
I may start a new Kylie thread methinks.