From the website: "With E*TRADE's open XML-based Application Programming Interface, you can now use industry-leading trading applications to execute your trades directly through E*TRADE - no additional software needed."
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There are no mashups for E*TRADE. If you know one why not add it?
Sorry for typos. I meant to write "The TradeKing API also _uses_ oauth, and _there_ are some code examples...."
The TradeKing API also used oauth, and their are some code examples in the TradeKing API documentation. Here, for example, is a link to some ruby code that worked for someone: http://community.tradeking.com/groups/tradeking-api/forum/topics/9572-trying-to-use-the-order-api-in-ruby/forum_posts . Maybe you could try adapting that to the e-trade API.