Yay, other people want Wii remote interfaces! Maybe we can collaborate to make something great. Most people play around with the idea of Wii remotes for a time, then get bored since they didn't build anything meaningful it.
I'm planning to make a "ten-foot interface" front end for mplayer (or some other media player like XMBC or GeeXbox) with the Wii Remote central to the design.
Its more like the Nintendo Wii home screen than a normal file manager. Along side local hard drive based video files, I'm going to place video links to my local BBC iPlayer clone. (By pulling the XML data from my country's on demand video services, I can display them along side my local content on my hard drive. I've played around with this before. Also I'll be caching the data and updating it regularly in the background, so it doesn't take an eternity every time you want to watch there video)
I want to use HDMI-CEC (the communications protocol in HDMI) which allows specific buttons on compatible TV remotes to be used with a HDMI device to have another way to interact with my R-Pi. (If you have a Bravia TV, the buttons labeled "Bravia Sync" on your remote control CAN BE USED WITH RASPBERRY PI !!)
I'm also planning on buying a cheap ($2-$3) Wii remote sensor bar, which I make USB powered by cutting up, so I don't need a Wii to power the sensor bar. Battery powered sensor bars have on/off switches, which mean I have to get up everytime I want to use a Wii Remote. A Wii "sensor bar" is just a few cheap infrared LEDs only drawing power from Wii, the Wii Remote has the expensive hardware: an infrared camera that sends the data back via bluetooth.
My dream setup will be to press the Wii Remotes power on button and have the Raspberry Pi send a HDMI-CEC signal to SWITCH THE TV INPUT TO THE R-Pi! Just like a Playstation 3 does when it turns on!
Hopefully, if GeeXboX or XMBC does get ported they'll implement these features. I'm not holding my breath, so I'll just do it and maybe they can copy.