How to use ‘Back to My Mac’ without using .Mac via iChat Screen Sharing
Thursday, November 08, 2007 - 01:52 AM EDT"One of the new features of Mac OS 10.5, a.k.a. Leopard, is .Mac’s Back to My Mac, a way to connect to your computer at home remotely. Back to My Mac allows a user log into another Mac remotely via internet. This is a great feature but it is only available if you are a .Mac subscriber. However, the new iChat supports Screen Sharing, so the only thing to figure out is how to auto-accept a Screen Share invitation and how to do it securely. This quick tutorial will show you how set up iChat to do just that," Melvin Rivera reports for All Forces.
"This set up requires that both computers run Leopard. You also need two separate iChat supported IM accounts, one for each computer. This could be AIM, .Mac or Jabber accounts," Rivera reports.
Full article here.
Related MacDailyNews article:
Apple’s ‘Back to My Mac’ plumbing features interesting mix of protocols - November 07, 2007

Of course, you can also use the built-in VNC server and any VNC client of your choosing (on Windows too!) so you can get back to your Mac from anywhere, even if you don't have a computer with Leopard available.