I've recently upgraded to OneNote2007. In the case of this much-overlooked package, the upgrade seems to be quite significant. For example, I can now have several Notebooks. Importing my 2003 OneNote data was fairly effortless, and the Print to OneNote driver works far better than on my old system.
Over the last few months, I had moved to Windows Live Writer (Beta) for writing my posts, but I am tempted by this system. The one thing I haven't figured out yet is how to add Technorati tags.