I was checking out the videos on Channel9 and saw this awesome one for the Tablet PC Education Pack. Check it out, the equation editor looks great. It's something I wish I had back when I was in University. I used to spend hours cranking out lab reports and papers and the equations took about half my time just to get them correct.
Plus the fact that you can store and search notes and include equations in those notes at about the same speed that it takes to write on paper makes this an incredible combination for students. It almost makes me want to go back to school and get my masters.
You can download the Tablet PC Education Pack here, but it only works on the Windows XP Tablet PC edition, so it won't work on regular XP home or Pro :-(.