I want to be a commercial photographer. I think your right, I have just about every type of photography in there and I don't really want to do many of them. Right now it takes 3 clicks to find a specific portfolio. In my next version I think rather than having 13 categories I'll just do the 3 (commercial, event, portrait) and put all the images together to eliminate all that extra clicking and loading of pages.
This was going to be my main point. You really need to be able to get to your work faster. If I was a client I'd have lost interest by the time I'd clicked the 4th link before seeing another photo.
A few things I'd suggest:
1) Have at least one photo on EVERY page. If that means that you have a banner at the top with a specifically chosen photo or random photo from a group, or whether each page has its own specific photo, it doesn't really matter. But you need to be showing off your work all the time.
2) I'd stay away from a white background. This is kind of personal preference, but I much prefer sites (especially portfolio sites) to be a darker color (gray or black). I think the pictures pop more, and they generally feel better designed.
3) Think through your menu bar/system. I think it looks OK when you've just got the one "L" line, but on your portfolio one, where there's two plus "L" lines, it doesn't work for me as well.
4) As a photographer, you are an artist. Your site should represent that. Even commercial photography clients will want to see that you've got an artistic style or vision. Make your site represent that. You may not be a web guru, but there are TONS of sites out there that can help you create a well laid out, well presented, and great looking website.
5) Make sure you test your site on multiple browsers (at least Internet Explorer, Firefox, and Safari). Even better if you can test it on IE6, 7, and 8, as well as a few older versions of firefox. There used to be a firefox extension called IETabs that let you load a page within firefox as if it were in IE. If you're on a mac and are having a hard time testing in IE, that might be an option.
I think you've got some good foundations here. You don't have too much on the site to distract from what you're doing, you just need to take those fundamentals and craft them into a site that really shows off your potential and your skills.