I just ordered the boxed version of iLife '09. I have iLife '08 (I think) that came with my iMac. I was thinking I will uninstall all the iLife '08 stuff then do a clean install of iLife '09. Make sense? What are you folks doing?
Seems highly unnecessary. You will likely miss a bunch of libraries and it won't make anything run any faster. Backup your photos and music and install it.