I'm late to the party but I'm gonna do a "the good,the bad and the ugly" routine anyhows.
The good...Its artistic and bold...something I applaud regardless of usability. The bullets for buttons is great.
The bad...The fonts take this somewhere between wow,thats so cool and dang this would be great if it were not for the fonts. Advice...offer a sub with MS fonts.(except for the titlebar and Start menu).At least tell them they can use WBconfig to force only system fonts.(never actually used that so I have no idea how it works)
The 'ugly'...this is where it gets more into personal taste.If you stroke a graphic (and you almost always should) learn to keep the bevel hilites off of it.They get washed out and your images start to look undefined and less pro.If necessary,put your stroke on a seperate top layer. (pushing hilites around is something PS pros learn early on...mostly just raising the lites altitude and maybe the depth setting too)
Also,with hilites...ALWAYS explore other hilites and shadows than the defaults (screen and multiply).Multiply works well mostly but screen is best at glassy gradient hilites.
When not doing glass,screen makes your hilite look dull and lifeless.Be adventurous and try multiple lite tricks.Multiple sources,stacked,hand drawn with vectors etc...(standard PS bevels are not always the best way to add 3dness to an image)
Personally I would keep the woodgrain off the buttons with the exception of the normal state of the taskbar...make the buttons see thru so they dont interrupt the grain.( I think that grain is too big to tile well but you chose it so you must like it,heheh)(there are lots of tricks to hiding tile points)
I dont want to hatchet this to pieces so thats more than enough...seeing as how your about done...snicker.uhhhhhhh...more brass...
oh,one more thing...metal gradients look better with more than one hilite...next time try adding a secondary weaker one to break up the shadow area.
Dont think just because I had so much to comment on that its not dang cool as it is...but I see even cooler in your future projects.
(thats what you get for putting me in your list)