I've just taken over the administration of a Windows 2008 web server from a previous employee on a temporary basis. I need to change the Admin password as soon as I can but I've noticed that quite a few of the services also run under this account. So:

1. Is there a quick way to find out which services will be affected by me changing the password or is it a question of going down the list?
2. It doesn't seem right to me that the Admin account is used in this manner; should I create a different account for these services, or is using the Admin a/c standard practice?
3. I realize everyone's servers / networks are set up differently, but are there any other items I should be aware of when changing the Admin password?

Thanks