The issues of corners and transparency have kept me building the framework of some of my sties out of tables, but I have a sense that even this is not a valid reason.
Admittedly, I'm new to constructing sites using CSS. It's frustrating at times. I've literally ended up scrapping everything for a site I was working on and starting over because I could not unravel the CSS puzzle.
Among a myriad of increasingly messed up positioning problems, a menu I was designing actually turned backwards on me and I could not for the life of me explain it.
Home | About | Services | Contact
actually became
Contact | Services | About | Home
It was at that point I realized I wasn't in Kansas anymore.
Still, I'm doing what I can to fight through the pain of the learning curve with the anticipation that I will be a better web developer for it.
I'm going to start a new thread about favorite CSS Tutorials. I hope you will all go there and submit your favorite CSS learning aid.