NiLuJe, thanks a lot for your work. Your font package made my Kindle experience much better. I would like to contribute my personal favourite font package, that's not currently uploaded to your page:
http://rapidshare.com/files/410832073/DroidStyles.zip
The first one is merely a collection of droid fonts with styles, that supports cyrillic characters. The second one is my favourite, where the regular font is replaced with the bold one. I use it with text size 3.
Again, much appreciate your work.