Techniques for good board handwriting

I'm a math TA and I find that my most consistent comment for improvement involved my board handwriting. Anybody have some tips or techniques I can use to make things a little neater on the board?

There are, of course, time constraints with teaching any course, so I don't want to simply write more slowly in order to assist in writing more neatly. Thankfully in a math course much of what I write is symbols which are easier to (borrowing a typography term) kern than sentences, but I still feel like I need to vastly improve my handwriting on a board if I plan on teaching for any length of time.

Any advice would be greatly appreciated. Thank you!