German Keyboard Layout under Parallels, VMWare, BootCamp and VirtualBox - Info - Schirmacher. Because I needed it just now - this moves the special characters that you do need occasionally when programming to keys that are more Mac-like. Not perfect, but much better than the standard PC layout, as the MacBook usually doesn't have any markings for these special characters, so you would otherwise search for them in vain.
Archive 17. February 2012
Mac Developer Tips » How to Uninstall Xcode. There is also an official way to get rid of XCode. Just linking to it, because unfortunately XCode can dynamically load what you need from the internet, but not get rid of it - for this you are allowed to delete the XCode stuff and then reinstall it (smaller). Just the iOS stuff alone takes up 6G, so you can save a lot if you don't plan to program the iPhone.
Xcode, GCC, and Homebrew. Looks good - Apple provides a bare-bones GCC package with all frameworks, so you no longer need to load the monster installer from the AppStore, but can make do with a 170 MB package and still use Homebrew to compile open source OSX programs (at least as long as they don't use explicit XCode features). Especially if your own programming takes place in other IDEs and with other languages, it's quite nice to be able to do without the 8 GB that an installed XCode occupies. I'm seriously considering whether I should also give my Air this slimming cure.