as I already wrote I like your blog. It could be useful to arrange your posts as following:
- creation of new pages: About me + Bar project
This means you delete the reffering posts and create them as pages, this would be a better structure.

Concerning the post of the articles you can keep the categories.

If you like you might add a title in your header in order to show the theme of your blog.

Nice to see your blog! It’s great that you use your blog for many different things, we can more learn about you. But there is no central theme to link together your different categories. Maybe you can find a central theme, and write it on the head-title instead of “Just another WordPress.com weblog”.

I find better if you separate clearly professional and personal stuff. Maybe you could create another page just for personal things, like you did for the “voluntary and associative work”. It’s great to speak about many different things about you! But it could be better structured… do you see what I mean?

Your first page is maybe too long. You can limit the number of articles per page you know? (here: http://mandriam.wordpress.com/wp-admin/options-reading.php) Then, to reduce the first view of your posts, maybe you can use the tool ‘more’. That provokes a curiosity in your readers, and then, they can read more if they want.

I like pictures of your blog, there are relevant and interesting. Your links are also relevant (for example BPW), keep going on this way!

Good Continuation!

Armelle