Hi, the Haiku website is mostly great (what a logo!) but I have a few suggestions that I think would improve it.
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Remove the grey margins. Personally I think this looks unattractive and they are far too big. I think it would be better if the color was changed to white, and the size of the margins reduced.
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Remove the right hand side menu. It only has three items in it, but takes up a lot of space for those three items. It would be more efficient if the menu were removed and those items were placed at the bottom, centered just above the copyright notice.
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Gentle shading for the left hand side menu and the main text body. Helps break-up the “whiteness” of the page, giving a little more definition. There could also be a dotted black border on the right hand side of the left menu.
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Changing the font. Personally I like the one I’ve used in the above mock up. There’s nothing fatally wrong with the current one, this is just a personal preference that you may or may not agree with. Also note how I’ve made the “Learn” text two points larger than the rest of the menu items.
Other, non-illustrated ideas
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The leaf image, although nice, takes up a lot of space. It might be worth considering instead making instead a greyscale, mostly transparent set of leaves to be placed in the far right of the page as a background, in a similar technique to what this guy has done on his page: http://www.prongs.org/afra/ Enlightenment also had something similar on their old website.
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Streamlining the menus e.g. merging “Newsletter archives” and “Newsletter”, as well as “Our goals” and “Our status”
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It also might be a good idea to use some sort of dividers between news stories.
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An RSS feed for the news might be nice.
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It might be a good idea (closer to release perhaps?) to actually put what Haiku is on the front page. At the moment there’s nothing that really indicates it’s a piece of software, let alone an operating system.
Anywho, there’s my comments. Keep up the good work. 
