I was looking in the task manager and I see I've got 13 svchost apps running. Isn't this a little much. Never had that many in XP Pro.
svchost.exe is just a generic process for services. If you want to decrease the amount just read the black viper service tweak guide for windows 7. If you do go messing around with service I recommend making a restore point pre-tweak this way if you jack something up you can go back to the restore point and not have to reformat/guess what you did to screw things up.
I got 16 instances. Be careful, if you kill some of these processes you may hang your computer. If all of these svchost.exe instances was initiated by system users (local service, system, network service), you are safe, it cannot be initiated in your user name if so it could be a virus that can consume about 100% of your CPU.