Rather than waiting for tomorrow to do my clean/install I did it today. With Time Machine I was able to selectively reinstall what I wanted. TM also reinstalled all of my network settings/passwords. I selected not to install all of my previous apps. But some of my files are still in iWorks format (ie Numbers) and because I've recently switched to MSOffice I had to reinstall Numbers. However my iWorks disk is fubar. No problem. I just restored my copy from TM. All is good. Can't say enough about how good TM is. Now I'm ready for a Snow Leopard upgrade! BTW cleaning the hard drive does make the MBP run faster. I've only been on mac for about a year and a half. In that time I installed various databases, Java IDE's, and other stuff. I don't need to do all those installs again because I've learned from those experiences. Hopefully I can keep the cruft off my hard drive that slows it down.