I don't want to sound rude, but the layout looks quite boring.

Like Jim said, the menu doesn't align proper in FF3.

You might want to read some of the following tutorials:

CSS Beginner Tutorial | HTML Dog
Floatutorial: Step by step CSS float tutorial
A List Apart: Articles: How to Size Text in CSS
A List Apart: Articles: Faux Columns
A List Apart: Articles: Sliding Doors of CSS
A List Apart: Articles: Sliding Doors of CSS, Part II
mezzoblue Testing Grounds