I loved my 15-inch Titanium PowerBook G4 and used it for almost 5 years.
When it was time to upgrade I thought the 17-inch MacBook Pro would be the ticket. I thought the larger HD screen would be fantastic so I bought one last January.
Last month I bought the new 15-inch Unibody MacBook Pro and I couldn't be happier.
It's amazing how much extra weight and bulk the 17-inch MBP carries vs the 15-inch machine.
I think the 15-inch Unibody MBP is the new sweet spot in the Apple laptop line.
I took a hit when I sold the 17-inch machine on eBay... but I'm diggin' the new MBP.
Cheers!