dyld: Library not loaded: /sw/lib/libglib-1.2.0.dylib
Referenced from: /usr/local/share/lazarus/lazarus
Reason: no suitable image found. Did find:
/sw/lib/libglib-1.2.0.dylib: mach-o, but wrong architecture
Trace/BPT trap
Is it possible that you installed the PowerPC binary libraries instead of the Intel libraries? Offhand that's what it sounds like from the "wrong architecture" error message.
Be sure to install the Intel .dmg for fink. It's possible that the PowerPC version of fink runs under Rosetta, but it looks like the GTK libraries won't.
Not sure what the best way to remove fink and the libraries it installed in order to start over. I know I've wiped the /sw folder clean a time or two in the past when fink failed, but you probably don't want to do this if it existed prior to when you ran fink or you'll be deleting files that other programs may need.
Maybe the fink team can help you here too - I don't see an uninstall instructions.