Links formating issue – IE vs. Mozilla (picture provided)

any help? ??

When I validate your page it complains document type does not allow element “li” here; missing one of “ul”, “ol”, “menu”, “dir” start-tag. for your sidebar links. So somewhere the lists are getting messed up. You’ll need to go through and correct this first because all kinds of wonky things happy when html isn’t correctly closed.

Once you’ve done that you’ll be able to control the spacing between list items with something like:
ul li { margin-bottom: 12px; }

By controlling the spacing that way you won’t need the <br /> tags either.

Other possibility would be adding value for line height, for example

line-height: 16px;