How can I forward my e-mails from my Hotmail to my Gmail?

It’s been getting annoying checking two or three e-mails every day, and forgetting what e-mail I used with what account when registering on websites. I found the “forward emails to another account” option, but it says I can only forward to a @hotmail, @msn, or @live e-mail address. So is it possible to make all the e-mails that go to my hotmail e-mail addresses to automatically go to my Gmail?