I have to say, I was just playing around with iPhoto and iWeb and they work quite well together (as promised by Apple). I retract my statement about Picasa being better for website publishing simply because Picasa does not have a partner such as iWeb.
I just purchased a new PowerMac G5 (2GHz dual 512 RAM) which is my first Mac and I am quite impressed with everything as far as preformance... except for iPhoto.
I find iPhoto almost as fast as Picasa (By the way, I ran Picasa on an Acer Laptop with 1.3Ghz Celeron 512 RAM!). But Picasa is...