indeed wierd sots.
i've took small peek to your main page source, and possible thing that "caught" my attention was this section:
You must first be a
registered member to view any code.
notice there are 2 </tr> - which is not standart - you must end your col (</td>) before ending your row.
so i would expect it to be like:
You must first be a
registered member to view any code.
note: it can also be the last </tr> is not even needed, then it would be something like:
You must first be a
registered member to view any code.
i really cannot be sure. the only way to verify this is manual "sweep" on your entire table tags to see there is closing tags to every openning tags. so i would think about going over html of templates there, prolly something not written properly/missing, and IE just "assume" what's missing & despite showing properly, while FF not giving too much slacks about it :p