One question saves a lot of time: How can I create something today, which works good enough (for now)? It's not easy to answer but worth it!

Example: For more than a year I wanted to create a web application database. How can I create it today? The answer: Posterous! After 30 minutes of setting up -it's online.

A nice API (and service), which sends one time and recurring invoices for you. I mean real letters by snail mail to your customers.

Probably most of the Internet users have an Email address and have a vague understanding of how to use it. Email is so optimized, that it's pretty much a no brainer to send one. With services like Posterous (blog by email), it looks like email becomes the new "command line" making tasks fast and efficient.