I forward them all to 1 account. However, even though I've set this up before, I can't for the life of me figure it out now.
Let's call EX the existing (old) email account that you want to keep and use daily (your personal one), and NEW the new one that you want to forward to your old one.
In NEW, settings>forward&pop3>allow pop3
In EX, settings>accounts>check mail pop3: add the new one.
The problem I'm having is that I can't seem to add the right settings for the new one (which is a google app hosted email)