Unless you are going to use this space (e.g. adsense) I recommend lowering this gap.
Short story: Lower gap, a more visible text colour, and a try to reduce page load a bit. Those things are really simple problems, you really got great work done already there, and I love all the awesome graphics!
Thats odd, lol you mean between the navbar (breadcrumb) and the bar with the links there is a space? If so, that's where my yahoo ad is, if not, I need a screenshot, lol
Using FF 2.0.0.6, everything looks fine. Awesome design, including the dark backdrop with the graphics. I agree with the font color on the writing, though. While it fits perfectly, it's just a bit difficult to read. Lightening it up would solve the problem. Not too light, just one or two shades should make it stand out a bit more...
Great design!