I am a .net web developer right now.
However,i would like to develop some mobile app.
Without mono,
could any other way help me do this?
Could html5+css3+jqmobile work?
I really do not know how could a web app works as a client on mobile phone.
I get some information about phonegap.
Could this make web app work as a client(without java)?
Phonegap will package your html5+css3+jqmobile to run as a native app in a mobile device. To answer your question, yes this will work without java but with javascript.