I read MacRumors all the time
In fact I've been following the news about the new Imac releases for the past couple weeks waiting for the new products to come out. My laptop died a few weeks back and I was going to buy an Imac but heard the rumblings of the new products coming out soon. So I was super excited when they made the announcement of the new products yesterday.
Now I just need to wait another week or two till the 27' Imacs with Quad Core come in and I'll be pressing that "add to cart" button
All that aside, Ipodtouchfans.com has a decent Iphone forum as well