@Jens: I currently fail updating to your newest version. I think the problem is that I can't install the new libwxbase (I have 2.8.7.1-1.1 and >= 2.8.9.1 is needed but not installed - maybe etch-wx doesn't work on my rather old system).
Edit: Ok, got it. I needed to use "-t etch-wx" to install the right versions. Like:
apt-get -t etch-wx install libwxbase2.8-0