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LOVE the idea!! Great idea, seriously. Like the version with tan background - although maybe instead of tan, go very light shade of blue? Right now tan, blue and red just seem to clash a little, but shades of blue and red will work well.
Your logo needs help. Honestly even just dropping that transparent stroke and making the drop shadow a much smaller size (like 1px distance, 3 px size) would help a good deal.
And the biggest thing for UI I would suggest is a strong descriptive statement either above or immediately below the browser divs explaining what the purpose/benefit of the page/site is.
