Oh sorry, i miss understood.
Your network is limited at 50megabits/s, but that can be increased if you ask them nicely

for no extra fee either.
Yes, its shared with other virtual machines on the same host.. But your particular virtual machine is isolated, ie they cant see your stuff, and you cant see theres.. you have full root access to your machine and can do what ever the hell you want, as long as its legal
On a linode 2048 your sharing it with a maximum of 10 other people.
Realisticly though, given the split of the cpu's etc, your sharing that with a maximum of 5 people..
id be surprised if you noticed the other people though. I have 2x768 nodes, and 1x512 node, and ive never hit cpu contention.
Cheers
_________________
ServerAdmin -
www.our-lan.com"Diplomacy is the art of saying nice doggy whilst looking for a really big stick"
"In my experiece, any attempt to make any system idiot proof will only challenge God to make a better idiot"