I use an Asus WL-330gE on my AV cabinet connected to an ethernet switch. This allows to connect several devices in my cabinet to the internet.
Some of the things this allows on the 722:
- Remote management of the DVR (Sling)
- Negating the need for a phone line (for PPV and avoiding the monthly fee)
- Downloading of over-the-wire programming (most costs money, but some is free and some of that is actually occasionally interesting, although most of that is usually in SD and not HD). This is separate from the on-demand programming which is limited, comes in over satellite and is stored automatically on the hard drive at all times for the off-chance that you're willing to pay for it.