tasklist and svchost.exe stuff

Came across something that I've often wondered about today.
Why do you always have lots of svchost.exe processes running when you look at task manager?
Well I've just worked out how to find out what they are, which could be very useful in the future if I have to try and fix someones spam-ridden pc again.

The tasklist command prompt tool lists all the running processes on your pc, in a similar fashion to Task Manager, however the strength comes in the parameters you can give it.

typing:
tasklist /SVC

shows the list of processes, with the names of the actual process not just the filename, very useful for identifying unusual processes, it will also tell you what svchost is really running. Useful.