I'm wondering if there's any interest in a windows based (.NET) trading client for MtGox.   I've developed one for my own trading purposes, and have been considering releasing it to the general public if there is sufficient interest.    I would release a demo version that can be registered/upgraded for .1 BTC to full functionality.   Registration associates the application with your mtgox account using an encrypted hash of certain undisclosed static account information, so it can be used across multiple PC's by a single user, but activation keys cannot be shared between users.

Some of the features which are not supported by the mtgox webpage include:

 - Placing a group of bids across a spread of prices automatically
 - one click "cancel all bids"
 - multi-select several bids and cancel selected with one click
 - built-in live market chart with depth graphs (in both total USD to price and total BTC to price)
 - live list of trades as they happen
 - your own socket.io connection to mtgox for streaming market data
 - uses HTTP api to place bids
 - trading will still work during most mtgox DDos's that may make trading via their web page impossible or annoyingly slow

Some planned future enhancements include:
 - Basic automated trading functionality (trickle buy/sell, automatic placement of bids based on distance from moving average, execute bid X when bid Y is filled, etc)
 - Automatic stop loss bids if price exceeds a certain level
 - Market chart enhancements
 - Historic market data availability

I'm posting this to get a feel for whether or not it's worth my time and effort to release and support the application or not.