I'm on a limited 8GB per month through plusnet, will I still be able to play online with other mii friends or will I go over my limit? What about downloading virtual games? Do I need to opt for an unlimited service from plusnet?

8GB is a fairly hefty limit so you should be ok. I've been playing MKWii extensively, along with usual surfing requirements for 2 PCs, 2 macbooks and a laptop .. .. .. nearly at the end of the month and our total download is below 2 GB .. .. ..

Thanks. How does the nintendo ds work with the wii? Can you play ds games on the wii? Do they connect with each other? Does this also use the wireless internet connection? Can you play wii games on the ds lite?

Trying to answer those in order

1 The DS / Wii connectivity is there, it's just not really been explored properly yet .. .. ..

2 No

3 Yes, but see answer 1!

4 No, local wireless connection. Both use the inbuilt WLAN adapter to communicate with each other without going through a router

5 No.. .. .. but .. .. some future releases will allow you to use the DS as a controller for the Wii (Pokemon Battle Revolution already does this I think)