Thats probably not the answer you wanted, but I could not agree more: http://www.ehow.com/how_6395069_forward-aol-mail-gmail.html.
I've converted so many people to gmail, heck even converted vast amount of yahoo mail users. You don't really have to even cancel your AOL e-mail. This will make the transition smooth for your important contacts.
Setting a filter that will label all e-mails from AOL in gmail: http://www.makeuseof.com/tag/set-email-filters-gmail-hotmail-yahoo/
Seriously, you won't regret it.