Recently, I had problems logging on to my computer because I had forgotten my password. So I used the Boot Disk to reset it and make a new password. Then I realized that I couldn't access the Keychain or Safari without the original password, because it wasn't accepting the new one. Any suggestions?
I am running an Apple PowerBook in case it helps to know.

Change the Keychain password, instructions here;

http://docs.info.apple.com/article.html?path=Mac/10.4/en/
mh463.html

I went there but it wasn't much help. It assumes that I know the original password, which I don't. Any other ideas?

I would suggest creating a new keychain and then deleting
the old keychain. To do this navigate to Macintosh HD-
>Applications->Utilities->Keychain Access. You might need
to click "Show Keychains" in the lower left corner if your
keychains are not visible. Delete your keychains here and OS
X should create a new keychain to keep all of your
information in. If you want to read more about this subject
go to http://www.apple.com/support/ and search for
keychain.

Good luck!