I have a Mac Air with pre-installed Lion. The other day I tried to download Open Office. After about 60%, the download just hung up and I gave up.
Then I tried to upgrade Lion from 10.7.2 to 10.7.3. Again, about 60% done and it stopped. Went from 2 more hours to complete to 111.
Needing Open Office since Windows for Mac won't read odt. files, I tried using my Mini to download the file. Same thing, Downloaded for 12 minutes, stopped at 8. Even babysat them, just to make sure the computer didn't go to sleep.

Been a long time since I had a download hang in OS X or Windows.

Also 4GB ICore 7