Possible factors:
You've got meta elements forcing IE 7 compatibility not IE 8, IE 7 is bad news and very few people use it. I would remove that. You actually have it in 2 places, make sure you remove both of them and then if needed try the IE 8 meta.
Your skin looks like it is based on a modified skin made in artisteer 2.4 which is very old. Artisteer doesn't provide support for designs modified outside of Artsiteer and neither do I, its very difficult to provide such support. If you are actually using Artisteer to make the designs I would highly recommend upgrading to a newer version of Artisteer, ie currently Artisteer 4 RC 2 is available and we have a plugin that can directly export a skin.
The Google translate widget has been known to cause layout problems, I would try removing that and see if it makes a difference or not.
Hope that helps,
Joe