If you're waiting for several games to download and install at once, you don't have to wait for them in the original order. Find the tile of the game currently downloading, press the Menu button (three horizontal lines), choose Pause download and the next app in the queue will start downloading instead. You can pause app installations in the same way.
To find everything that's downloading and installing in one place, go to 'My games & Apps' then 'Queue'. The Menu button can come in handy for all kinds of context-sensitive operations, so it's worth experimenting with it as you move around the system, as you'll often find quicker ways of doing things.
