Some time ago I wrote an application for the Desire which allows to change the system fonts. It used to be free at the beginning, bit when I moved it to the market I started charging for it in order to get something back for the time which I spent on it. Once I put it on the market I added a few extra things like the ability to change the screen density which allows you to get more space on the screen, as well as tried to make it compatible with other devices too. So I'm posting it here in case it may be of use to anyone. You can read more about it here if you're interested. Fonts are not included for legal reasons by the way, so you will have to find some and add them yourselves. That's the only catch...
Requirements are that you have root with system write access, and busybox.
Download (£0.70 or ~$1.10):
If you have any comments or suggestions, feel free to shout them out. Thank you.