I love your header and colors - the design is very appealing overall.
You might want to highlight what topics you write about on your "About" page.
The way you have little notebook posts without titles interspersed with regular posts is a little unconventional. I like it, but you might want to offset them a little more visually and help readers understand how they are different.
You might consider reducing some of your sidebar items, to make room for your tag cloud in particular.