There are several existing outdated frameworks, but Nokia is strongly promoting its new Qt product (well, now it’s not so new :), they bought the company that developed it some time ago). Thus, in their opinion, Qt will be used in an increasing number of their phones, and this is my suggestion that you start there, as this is “new material”, and there will probably be more and more contests for applications where you can Publish the application and use it as a link (if you are serious about it).
Qt - , . , , Qt Mobility, , , , ( Qt, )
, , . , googleing; -)
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edit: , , , - qt Microsoft sdk... , : )