I replaced the last of the few wxBase dependencies in bitcoind.
bitcoind now compiles without wxWidgets or wxBase in SVN rev 112.
main(int argc, char* argv[]) is added to init.cpp. CMyApp and the Startup folder stuff are moved to ui.cpp. ui.cpp and uibase.cpp aren't linked by bitcoind.
The makefiles have -DGUI to control whether the GUI is used.
I test compiled MinGW, VC and Ubuntu. I don't know if I broke the Mac OSX build, someone will need to check that.