While Office can store multiple objects on the clipboard when working in applications like Notepad this facility is not normally available.
Clipboard Manager does this job maintaining a history of items copied to the clipboard.
I have tried it on a Windows 7 computer and it gave me a couple of errors. I will try on XP tomorrow.
It is open source and portable.
Link: Clipboard Manager | Download Clipboard Manager software for free at SourceForge.net