Colours: A bit too grey for my liking. You have so many warm and 'happy' colours in your header - why use so much grey anyway?
Typography: Your headlines are pretty small - you should give them more weight and colour to make them stand out - so your reader's eye can jump easily from one entry to the next. Also navigational texts (like comments or the date) could be smaller to draw less attention.
Layout: Nice proportions - dislike the many box areas. Just make the layout to static and blocky. Give yourself a bit more space - less boxes and lines.
Overall very nice.