You may have noticed that Java=>Editor=>Templates throws an exception with Maclipse ... That's because there is some code that presumes there is a non-null vertical scrollbar. With Maclipse, we autohide scrollbars on Leopard, which causes an NPE in that code. I avoided fixing this because it brought in an entirely new plugin that we had to hack, but it's just one line, so .. meh.. at this point, why stop now.
So to prevent that exception, you will want to grab the Workbench Texteditor UI plugin provided in the links area.
cd /Developer/Applications/eclipse/plugins && curl -O http://webobjects.mdimension.com/wolips/preview/org.eclipse.swt.carbon.macosx_3.4.1.v3452b.jar && curl -O http://webobjects.mdimension.com/wolips/preview/org.eclipse.ui.workbench_3.4.2.M20090127-1700.jar && curl -O http://webobjects.mdimension.com/wolips/preview/org.eclipse.ui.workbench.texteditor_3.4.1.r341_v20080827-1100.jar