The design itself is very good, but as Jesus already mentioned I think you should add a describing text about the kaplang blog. Make the logo a bit smaller and add it there.
The header is a tad bit busy for my liking. It also doesn't seem to tie in with the content area of your blog. The rest looks pretty good, just work some more on the header.
One could debate Grey for an eternity so lets not.
I would say just darkening a tich on the right hand side may make it a little easier to negotiate.
Really an excellent blog and 10 out of 10 for originality in my book ' Very nice design and I bookmarked because your content is right up my ally.
Great design! The only thing that jumps out at me is the text in the right column -- I can't read it. Please make it darker and more readable!
LOGO POSITION -- Your logo visually disappears in the background. Not enough contrast. And you're ignoring web design standards by placing it on the right side, instead of on the left where people naturally expect it to be.
MAX WIDTH -- Your body content spans 600px in width. Which is longer than the recommended 480px. As your line length goes above 480px, it takes more and more time to read. Because the transition of reader's eye, from end of one line, to beginning of next line, takes more time.
TYPOGRAPHY -- Body text feels a bit small. It's difficult to read. And I feel it could use some more line-height.
DATES -- Not noticeable. They disappear into the background. And on article pages, you don't even show the date. Also, you don't show the year. That might be convenient from a design perspective today, but when people are reading your articles a year from now, they won't know the article is old.
And I can't help but feel, I've been on your website 10 minutes, and I still don't know what a kaplang is. Also, you don't have a tagline, welcome paragraph, you don't have an about page, and you don't use categories in your blog -- so it's not immediately apparent as to what your blog is about.
Could use some work.