Everett,
You can setup Gmail to pull in mail from other accounts or you can setup you other accounts to forward to Gmail. I have some of my email accounts setup this way. Setup is straight forward. Login to your Gmail account and click Setting (upper right hand corner) and then go to the Accounts and Import tab. Click the Add POP3 email account button and follow the wizard.

More details can be found here: http://mail.google.com/support/bin/answer.py?hl=en&ctx=mail&answer=21288

Thanks for dropping by and I hope this was helpful.