IIUC, ESPN3 games are also regional over-air broadcast games. If you're in the over-air region, it's blacked out. ESPN, ESPN2, and ESPNU are available on ESPN3 or WatchESPN if you have set-up an account based on your cable access. If you can watch the (ESPN, ESPN2 or ESPNU) game on your tv at home, then you can watch it on ESPN3 or WatchESPN.
All these games are available on ESPN3 starting about an hour after the game.
If you don't have access to ESPN at home, then the only way, as I understand it, to watch the game on your computer is to use the links in post #2 or #3. iiuc, they're safe if you don't click on any additional download.