I think that is normal, including the orphan blocks. They are probably files for Undo/Redo which were not deleted because Audacity did not quit properly.
Haelen, to begin with - are you sure you installed Audacity properly? See Installation: Do NOT run Audacity from the DMG!!! .
If that does not help then as well as telling us what you are doing just before the crash occurs, tell us what version of OS X you are using. Also please give us the Mac crash report. Open Finder, then choose Go > Go to Folder and type:
~/Library/Logs/DiagnosticReports/
The Audacity crash reports should be saved there (or if you are on OS X 10.4 or 10.5, at ~/Library/Logs/CrashReporter/).
Gale