I just upgraded from a mini with two gigs of ram to an iMac i7 with 12Gigs of ram.
Also in the past I've worked on MacPros with 2Gigs of ram.
After seeing what a difference ram makes, I hope all my systems will have at least 12Gigs. I cant believe how people are so willing to buy whole new systems when they havent even upgraded the ram. How can they say their system is slow when their running with such a minimal amount of ram.
Its like buying a race car and driving around in first gear, then selling it for next years model because it just didnt go fast enough.
Especially now with CS5, now you can have photoshop access more than 2-3 gigs of ram. I love this new iMac, i never wanted one before, i always go for the MacPros, but this thing is a monster, I have Illustrator, InDesign, PhotoShop, Bridge, Safari, Mail, Contact Manager (Daylite), iTunes....whatever i want, all open at the same time and no slow downs. If Photoshop is crunching away on a process, i just smooth as butter go over to Indesign and do some layout work.
Before, i was an idiot. Using my computer with only a few gigs of ram is stupid if its for business. The biggest waste of time. Now, its like I opened up the doors, no more working in a small box, the sky's the limit. Its beautiful. And im still using CS3. I cant wait to get CS5.