[antiRepublicrat]

And the day that OS X and Linux ever have as many desktop users as Windows, they'll have to actually focus on real usability problems.

You do NOT want to go into the area of Windows and usability. Windows' usability only looks good when compared to Linux, but it's pretty bad when compared to a Mac.

[IncPen]

it's pretty bad when compared to a Mac

You're too kind. Windows' interface design is abhorrent.

I frequently show Microsoft screens to clients (and get a big laugh) when I'm demonstrating how NOT to design an interface.