I have 3 DIVs I'm floating left so they all line up in columns.
The middle (2nd) DIV is a separator. The outer DIVs are the main content and I have set each of their width to 49.5% and the middle separator DIV to 1%. FF and IE seem to handle this fine and does display differently than using 49% on outers and 2% on inner.
Any reason this is a bad idea to use a half percentage for the width? I see nothing saying you can't but nothing saying it is an acceptable value either.