They said that the whole line would be Intel based by 2007. If you buy a PPC based Mac today, it will still be supported until the warranty is ran out and having just bought my MINI (October last year), they still support it as well.
I suppose in another 3 years I will get another machine, but in the meanwhile, I see no problem.
Yes, they are going to stop manufacturing PPC based Macs this year, but the ones they sell will still be supported up to three years from now to fulfill AppleCare Warranty contracts.
My thinking, go ahead and buy the PPC based models and enjoy the savings :-)
Of note, Adobe (Photoshop) has not made a Universal Binary yet to my knowledge :-)