The Droid Sans font has some errors where the descenders extend beyond the
defined limits of the font. This is easiest to see in Windows, just open the
the font in the font viewer and look at the letters 'g','j', or 'y', especially
at small font sizes. The bottom gets cut off.
The font as it exists in the latest Android SDK (though the build ID is the
same?) helps quite a bit, though it still truncates a bit at some sizes.
Please note, if looking at these in Windows Font Viewer, you must not have them
open at the same time, as Windows will simply display twice whichever was
opened first.
I have not thoroughly checked any other Droid variants, but they should all
probably be updated.
Thanks,
Dan