I just recently rented the first volume of TNN 
(subbed!) and you're right, if you can get past 
the first 3 episodes..you're hooked! And that 
damned opening song....*sigh*

So in addition to Marmalade Boy and Slayers, I'm 
also looking out for TNN cels. I spotted a nifty 
one of Yuusuke and Noelle that I LOVE...*Drat*

I finally feel like a real collector.