1. I typed in www.kernel.org
2. I looked for the new kernel on the page that loaded.
3. I clicked on the link and my download started.
On the new kernel.org:
1. I type in www.kernel.org
2. I look for the new kernel on the page that loads.
3. I click on the link and my download starts.
Conclusion: Good job. You made the site look more modern without disrupting the most common workflow.
The only 2 suggestions I have are
1. The entire container for "Latest Stable Kernel" should be the hit point; yes, all of it, including those words.
2. When I hover over the tabular download links, my eye can get confused on which row I'm on. Something purely css and really subtle would alleviate that; for instance:
* changing the row background color
* changing the color of the font for the row
* prepending a UL style dot to the LHS of the row
* making the bordertop and borderbottom more distinct
* underlying or italicizing the words
any of these things would help and I'm totally agnostic to what is done; it would be a quick fix that would really make the thing less prone to human error.