According to the publish.ovi.com FAQ:

The publish to Ovi tool accepts a variety of applications for both S60 and Series 40 devices, including: Java, Flash applications (packaged as .sis or .nfl,) widgets, ringtones, and more.
It just makes me wonder whether Ovi Store supports native Symbian S60 applications. If it does, isn't it odd not to mention it anywhere? Though maybe I've just missed that bit somewhere.

So, how is it?