I'm sure you all already heard this type of questions, but it's still unclear to me. On my site (http://echodev.com/), everything looks fine in IE, but in NS the main cell is aligned kinda weird. Why is that happening?
There is some inconsistency in your tables width tags - the "Tutorals..." table and on the right "Echo Mail" table inside main "Content" table.
I've got quick solution for you:
Change the width of those tables to percentage, meaning set width tags to 100% instead of pixels. That will do it...
If you have some troubles, mail me, I will re-format your page to look good under IE and Netscape