[mva]

I don't really see why Linux should have a separate category at the top. Doesn't really fit the line of Business / Gadgets / Programming. Maybe add a category for UX/Design? Or maybe a category focused on startups?

Overall, awesome project. Keeping an eye on it!

[kia]

I agree about Linux. People using different OSes (fanboys) might mistakenly think that this site is mostly Linux news (the first impression is the most important one). You obviously don't want loosing this kind of audience. So add categories for other major OSes or remove Linux entirely.