Tracking computer usage, free credit monitoring, and digital forensics guides from corporations

I have collected several random stories recently that do not deserve their own post alone, but that I thought should be shared.

• From Lifehacker, this post shows you how to see if someone has been using your computer when you were not around. Using the Windows Event Viewer, users can see system logs detailing each time the computer boots or wakes from sleep or hibernation.
• This isn't an endorsement nor do I really know much about this service, but Lifehacker did an article about Credit Karma, a credit monitoring service that notifies you of changes via e-mail. The service once restricted its number of users, but it is now free to anyone who registers. WSJ, NYT, CNN, and others have also recommended the service.
• SANS's Computer Forensics website provides links to corporate handbooks for digital forensics investigators from companies like Microsoft, eBay, MySpace, and more. Some of the information is outdated, but it may give you an idea as to what is required and who to contact.