Some comments.
1) I'm seeing white san-serif text on a black background, with some green san-serif text. It's readable here. But it's more traditional these days to use a light background with dark text. As Peter says, black backgrounds were vastly over-used and now look dated. I'd suggest a more traditional fore/back color combination. Making the line lengths shorter by breaking the page up into smaller regions would also make it much easier to read. (Remember why newspapers have columns.)
2) The page is very difficult to scan at a glance and know where to get more information. There aren't immediately obvious sections or navigation menus. People are lazy - you shouldn't expect them to know they need to scroll down to find out answers to questions. Bold green text as section headings is too different from what most people expect, I think. It seems to be accepted now (just based on a gut feeling) that scrolling on the first page should be minimized, so you may want to put at least some of the sections you have now on separate pages.
3) I wouldn't put Google ads so close to the top of the page. It looks like you're more interested in advertizing than telling about your software. If you do put them at the top, put a box around them or something so that the reader knows where the ads end. I don't think people mind them on the right side or bottom of the page.
Take a look at these pages: [link|http://www.ultraedit.com|UltraEdit], [link|http://perso.wanadoo.fr/pierre.g/xnview/enhome.html|XnView], [link|http://www.bitlogic.co.uk/products_borland.htm|BitLogic's Borland Products], [link|http://www.halegroves.com/|Hale Groves], and [link|http://www.us.playstation.com/|PlayStation]. Those sites promote a lot of different things, but it's immediately obvious where you should go for more information if you've never been there before. None of them use a black background. Even [link|http://www.idsoftware.com|Id] doesn't use black any more. :-)
My $0.02. Hope this helps a bit. Good luck!
Cheers,
Scott.
