well as i didn't know that people here are not familiar with these fonts ,i love my N900 as you guys do too , just sharing my love with this devise :P

well THIS IS NOT MY WORK .
(repeating) this is not my work , collected from an other forum

sharing it to let you guys to have more fun with your devise



p.s INSTRUCTIONS

you can use theme customizer to change the font but theme customizer dont change the font of menu icons and of the digits on lock screen and of the message written by the interal keyboard .

for that you have to edit the files in /usr/share/fonts/nokia .
how ???
the complete instructions are in zip file. .
http://www.mediafire.com/?yzx02vqdl475q3h



update :
you can select any font you wanted to.
just replace the orignal nokia fonts which are in the zipped file and then download any .ttf font you want
( courtesy : corduroysack ) you can download fonts from www.dafont.com and just simply place them in /usr/share/fonts and enjoy