The design is too plain, I would suggest changing it theme to something that's more related to your niche. (There are millions of blogs using the default WP theme, you want to stand out from the rest). Good luck
there is not much to review about ur site it is just a simple Default Wordpress Theme Change the Theme make some changes so that we can give a better review of it
Yes, change the theme. The light blue header looks typical and newbish. I would not want to revisit a site without uniqueness. Thousands of others have that same theme. You should use one of these: http://themes.wordpress.net/
At the very least get some sort of graphical header, or something that makes it look less plain. Ideally you want whole new theme as others have said. Also, what is the aim of the site? It seems to be a mixture of all sorts of different posts with no distinct link between them.
Here you go - check out this site, they have hundreds of different themes http://themes.wordpress.net/