@geir Where you start depends on what you want to do. If you want to get an idea of how things fit together I suggest trying it the instructions in the 31st August Dev Update.
The Launcher is now a service, but also the place a user will enter their credentials. Once logged in, any SAFE Apps she starts will connect to the launcher, which will check if the user is OK with them having access and then return a session key to them. (An earlier version of the launcher was an application that used to display a list of SAFE apps the user could then start, but that was mothballed a few weeks ago. Now it’s more like a service, which also handles user authentication - so it’s the only thing that sees user credentials).
The MaidSafe libraries are all fairly easy to build now - but some tests require “–features=use_mock_routing” to succeed or they will hang (though most do not). You will still need to use the “nightly” build of the Rust compiler, and make sure you have built and installed sodiumoxide (this should all be in the README on github but people often miss that details).
Most issues people hit have been asked and answered on the forum, but it’s often quicker to ask again, just give a full description of your system and the steps you carried out to help people spot if you missed something and point you in the right direction.
I’ve been trying to build the dns_example (the “Uploader”) and the safe_firefox_addon but not succeeded in building working versions yet (there is a live topic about this: Has anyone built dns_example or safe_firefox_addon?).
Shout if you get stuck - good luck.