[I really should be posting faster. I started typing this when there were no replies yet]
I teach (mainly) junior university students ISO C++ in the Nethelands.
There seem to be a disproportionate amount of Dutch people here :shock:. Then again, maybe I just notice them more as I'm one of them

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First thing I did was downloading the Win32 (XP) version, latest release candidate obviously. Later I'll go for the Linux version.
The Linux version is currently somewhat prone to crashing. Rick just today
announced he thinks he's found the cause but also thinks it's going to take quite a lot of work to fix it.
1) Where in the IDE do I find detailed info about the current GCC/G++ version?
Most detailed you'll find is Settings -> Compiler -> Programs tab, but that mostly lists the path settings. To get the actual version number (if that's what you meant), you'll have to run
gcc --version from the command line manually, Code::Blocks won't do it for you.
2) Am I allowed to use DevPacks to upgrade my GCC/C++ compiler. Are there any pitfalls I should be aware of?
Should work fine, but if the paths change be sure to go to the above-mentioned tab and click auto-detect or change them manually.
3) The source code formatter "Astyle" is jolly handy. You won't believe the code format I sometimes receive from students.
Question: Where do I configure various settings like tabwidth. Currently it set by default on 4 sapaces. I would like 2 spaces. Furthermore I may want to enforce ANSI style formats. If it is possible to configure the built in Astyler then please do inform me.
Settings -> Plugins' settings -> Source code formatter (AStyle)
It has a predefined ANSI setting, as well as K&R, Linux, GNU, Java and of course the ability to set everything just the way you like it.