Bumping through the D7 site, I'm seeing an issue that is going to annoy the crap out of me and is probably going to annoy the crap out of the end users, it's the menu.
Speicifically, what I mean is when you choose a tab in the Main Menu and hover on it, it opens the submenu as it should, however that is where it ends being user friendly. As you mouse down over the submenu items to get to the ones that you want, if you come down it to quickly it removes the drop down on you. You literally have to hover for a 1/2 second or so over each item in the submenu to be able to keep it there and get to the ones on the bottom. Now, I know I'm not some super fast freak at hopping from main to submenu and we have billions of users who can move a mouse faster than me, but this thing is designed for the old person to use it and anyone who regularly uses the net will just get frustrated with how it works.
Also, if you come down it on the left 1/2 of the submenu no matter what the speed it puts the submenu away as you get down to the 2nd menu line.
I would be much happier to see boonex use a menu closer to the CSS menus that Aramis has created for D6, they work much smoother and do not care about the speed you move from item to item.