Google-drive – How to search for keywords in Google Docs, and see the results with context

I have many documents stored on Google Docs as text or spreadsheets.

In many of them I put little "todo: something notes"

I would like to search though them and see a list somewhere

Is that possible? Is there an iGoogle gadget, or desktop application, or website, or feature on Google that I have not noticed.

Currently Google supports search docs via GMail, and from docs, but doesn't show search results previews. ie I want to see the content of the todo in the result. eg

search results;

MyBigDoc, todo: get out of bed
MySpreadsheet, todo: make some money

I had a look at the Google docs API and its pretty clear that this would be possible usnig a docs gadget or an iGoogle widget, or even a desktop app.