I started out years ago in iPhoto (actually Picasa on Windows, then iPhoto when I moved to Mac in 2007). But I just got my first photobook that I built in LR, published by Blurb. That's the end of iPhoto! I have liked iPhoto, but it's a resource pig, and bogs down my Mac far more than LR. Additionally, the database it creates is really huge, and the adjustments are far more limited. For the last couple of years (maybe the last 2?) I've been managing both a LR and an iPhoto db. Adjustments and jpg output from LR, stored in iPhoto. From iPhoto, I could create books, cards, etc. and also keyword in iPhoto and share the photos with my wife, who preferred the iPhoto interface. But keywording and publishing have gotten far easier in LR, and I have to say the book quality from Blurb is every bit as good as what Apple produces. Plus, I can keep the files in an external file structure (rather than iPhotos proprietary db) and it simplifies my workflow, and I feel more secure in being more platform independent. I'm going to dump my iPhoto library (to the tune of 30GB of saved space) and move my wife over to LR, too. Just thought I'd share, but the real change has been the first book I did in LR has shown me there is no reason left to keep iPhoto around.