Nice try; You're not the first to bring this up.
First, just so you know, the use of USB drives is not against our rules of discussion here. So if you want to use it for playing media or launching apps, go right ahead. We'll gladly help you get it set up.
Now, as far as loading backup games via USB goes, it's strictly not allowed to be discussed here. This is simply because the knowledge within such discussions can be used to illegally play (pirate) video game software. Furthermore, the methodology used to run such software is liable to brick (ruin) Wii's is done incorrectly or if you just have bad luck (yes, I'm serious about that).
As anyone on this forum can tell you, people who wish to illegally play video games are generally lazy, selfish, and rather unfriendly people. A quick scan of any forum which condones USB loaders under the guise of legitimacy will reveal hundreds of topics posted every day along the lines of: "Plz tell me how 2 setup usb loader step-by-step thx bi". By removing all discussion which should relate to piracy on our forum, we don't have this problem and instead have many happy users who participate in a more involved level of discussion. In fact, the other forums (particularly gbafail) have a handful of users who provide only misinformation leading to bricked Wii's because they think it's funny. We also don't have this problem here.
By avoiding connecting our forum to piracy we keep a good reputation which brings only the most helpful of users to our forum and we help keep a few more Wii's safe. It might not be the best set of rules, I'm sure you could still find things to argue with me here. But they are rules. And without them, we would have a horrible discussion forum.