NEW! iSlimPhoto now works great with Apple's Aperture 3.3 and later, as Aperture uses the same Unified Library format as iPhoto.
Mac|Life: "****GREAT - Using iSlimPhoto is a single click affair. For showing off photos on the go, iSlimPhoto can put your megapixels on a diet." - 20 Killer Mac Apps Under $20, Mac|Life, June 2011
The Mac® App for shrinking your iPhoto® library by 60-90% while significantly improving iPhoto® performance.
Slim your iPhoto® library to take it with you on your MacBook®, without any visible loss. Keep the BIG library at home on your iMac®, an external drive or a Time Capsule®.
Or, if you will not need all those megapixels anymore, after using the app you can just delete your BIG library and replace it with the slim one to recover 60-90% of your disk space and improve performance significantly, especially on slow systems/big libraries.