yes
yes
Your best bet is to buy an HDTV (if you haven't already) and then buy an HDMI cable, and also a component cable hookup for you in able to connect your Wii using the HDMI cable. Otherwise, USB cable won't do.
Cable TV
To connect a nexus 7 to a TV you need a slimport in order to connect it to an HDMI cable
Get a monitor with an HDMI or analog input and connect it to a cable TV tuner.
TV
Very very easy. does your DVD Player ( Home theatre ) have a HDMI cable? If it does, you can just buy an HDMi cable and connect it to Hdmi 1 on your tv and the other end to the Dvd Player and the sound a video will be very crisp. Alternatively, you can use an AV cable ( cable with yellow plugs on the end) and connect it to an AV output on your tv and DVD player. If you are using only the tv's sound this will work, but if you are using a amp,etc. you can connect 2 RCA cables to the tv and the amp for the sound.
You unhook the connection from the cable box to the TV and connect it to the VCR input. You purchase a short cable and install it from the VCR output to where the cable was connected to the TV. The TV will get the cable box signal through the VCR with no problem when you are not using the VCR. If the cable box was connected to the surround sound or Home Theater and then the TV then connect the cable box to the VCR and then the surround sound or home theater.
download Windows Mobile Device center
These cables are used to hook your computer to your TV. When buying the cable make sure you get one that is long enough to connect the two. You don't want to have to sit too close to the TV. when using your computer.
Use the DVI port. You can use a dvi cable, vga cable (using the dvi adapter that came with your computer), or a DVI to HDMI cable. Just plug the cable into the computer and the tv and your Mac will do the rest.
Google TV is not a television, but you can connect Google TV to your cable or satellite receiver. You can surf the internet and visit websites using Google Chrome.