when installing gnome-do on a fresh F15 install it installs mono-devel for dependencies. this shouldn't happen.
nant-0.90-5.fc15,log4net-1.2.10-15.fc15,banshee-community-extensions-2.0.0-1.fc15,mono-2.10.1-5.fc15,monodevelop-2.4.2-2.fc15,banshee-2.0.0-2.fc15,mono-debugger-2.10-1.fc15,gecko-sharp2-0.13-20.fc15,gnome-sharp-2.24.1-6.fc15,gio-sharp-0.3-1.fc15,webkit-sharp-0.3-6.fc15,mono-addins-0.5-5.fc15,mod_mono-2.10-1.fc15,xsp-2.10-1.fc15,gtk-sharp2-2.12.10-7.fc15,libgdiplus-2.10-2.fc15 has been submitted as an update for Fedora 15. https://admin.fedoraproject.org/updates/nant-0.90-5.fc15,log4net-1.2.10-15.fc15,banshee-community-extensions-2.0.0-1.fc15,mono-2.10.1-5.fc15,monodevelop-2.4.2-2.fc15,banshee-2.0.0-2.fc15,mono-debugger-2.10-1.fc15,gecko-sharp2-0.13-20.fc15,gnome-sharp-2.24.1-6.fc15,gio-sharp-0.3-1.fc15,webkit-sharp-0.3-6.fc15,mono-addins-0.5-5.fc15,mod_mono-2.10-1.fc15,xsp-2.10-1.fc15,gtk-sharp2-2.12.10-7.fc15,libgdiplus-2.10-2.fc15
nant-0.90-5.fc15, log4net-1.2.10-15.fc15, banshee-community-extensions-2.0.0-1.fc15, mono-2.10.1-5.fc15, monodevelop-2.4.2-2.fc15, banshee-2.0.0-2.fc15, mono-debugger-2.10-1.fc15, gecko-sharp2-0.13-20.fc15, gnome-sharp-2.24.1-6.fc15, gio-sharp-0.3-1.fc15, webkit-sharp-0.3-6.fc15, mono-addins-0.5-5.fc15, mod_mono-2.10-1.fc15, xsp-2.10-1.fc15, gtk-sharp2-2.12.10-7.fc15, libgdiplus-2.10-2.fc15, boo-0.9.4.9-1.fc15 has been pushed to the Fedora 15 stable repository. If problems still persist, please make note of it in this bug report.
This seems to have been fixed.