Help me decide about my product idea. I'd like to make a twitter client that is able to do two things:

- filter stream noise "I waked, I ate" etc based on ML methods

- show you most popular discussions that your followed people are carrying (by means of my super secret algorithm), popular discussions based on topic etc. that you normally loose in a sea of noise

- maybe even organize your tweeted links under some taxonomy, or the tweets themselves, make graphs about what you tweet, etc.

Are these ideas on par with twitter client development laws? Should it better be a plugin to a popular client (which?, I never used any!)? Would you find it useful? How should I monetize it? Should I make it a web service? Anyone doing the same? Are these things profitable? Can twitter cut my string afterwards?