gloubibou's comments

Keyboard shortcuts help you work efficiently. Add keyboard shortcuts to common tasks. Use shortcuts that are easy to reach and easy to remember. Get your work done faster.

CustomShortcuts makes adding your own shortcuts to Mac menu items a lot easier, even fun.

→ Auto-completion helps you navigate menu hierarchies → It makes sure you get menu titles exactly right → CustomShortcuts checks for ambiguous menu items

HoudahSpot extends Spotlight. It helps build queries using the many search attributes available. Customizable result display make it easy to browse and pick files. The search text is passed on to the next application where finding content is a matter of pressing command-G.

Option c is the way to go. Up to the app developer to see how to monetize the app.

Bonus points if the end user can be identified. E.g. if the app can pass an opaque token to the web service. Reporting / billing from the web service provider groups usage by token.

Don't forget desktop and mobile applications. Most mapping and geocoding services do.

- I have to ship my API keys to end users. Someone could grab it and repurpose it - Rate limiting by API key penalizes one end customer for the other's misbehaving

I would love an API that is aware of the end user. Applies rate limiting on a user basis. Allows for anonymized user-based usage report. E.g. number of end users, average number of API calls by users, …

If you want a nice GUI, try Tembo (http://www.houdah.com/tembo). Tembo is a Spotlight front-end. Incidentally it searches all indexed locations, including Library folders.