A good Google blog, I know the owner too:
http://blog.outer-court.com/
Back2TheRoots, a good Amiga site:
http://www.back2roots.org/News/
Scene.org + pouet.net, some stunning demos here including by
Fairlight, the legendary Amiga crackers (who still do PC games):
http://www.scene.org/
http://www.pouet.net/index.php
There are loads more that I like, these are just some random ones from my bookmarks.