It's only some updates. My friend got a new dual 1.2 G4 last week with 10.2.1 installed. There were about 9 updates (ical, imovie, firmware, itunes, 10.2.3 combined, IE 5.2.2, etc). Half of them downloaded and installed, the others never even started the download.
Then I tried to download Safari on my computer this morning and it wouldn't download either. Maybe there is something funny happening with the campus network. Things have always worked for me previously and it seems to work at home.
kman