Conclusion: There are a myriad other small improvements – too numerous to list – which make this application much more pleasurable to use. Also, as the price has reduced so sharply there's no financial reason not to upgrade.
Pros: Much faster; more adjustment tools; excellent Raw conversion; better redesigned interface; great integration with iLife; massive price cut
Cons: Still not compatible with older Macs and older OSX versions; no Windows version
Excerpt: Before Apple's Aperture hit the market a couple of years ago, RAW converters simply did just that - convert RAW files. Aperture broke the mould with its all-in-one approach to post-production.