There's a lot empty space between nav menu and content of the site. You can use that to put some text, like who you ware, what you do, etc.
For a designer (if you are one) you sure don't have good enough logo.
I don't get it. I mean Flash portfolio/tutorial site? Your site is not made in flash and there's no information about what you do. I guess it's just unfinished
Anyway, it reminds me on Mac-like design witch is mostly used for Mac software or some internet services. Although it looks great it don't look (to me) as a portfolio site. This is mostly because there's not enough graphic elements and use of boring colors. Portfolio site has to be creative not corporate like.
I don't know what you do so I can't really post a good review but I hope this can be helpful.