I find it somewhat funny that accessing your mac through a dynamic dns service while out and about is now being described as ” ‘Back to Mac’ without .Mac”. I guess not many people knew you could do this sort of thing long before Apple introduced the Back to Mac feature in Leopard.
I’ve been using pretty much the exact set of instructions that lifehacker.com lays out in their article for several years and it works very well. I won’t duplicate their instructions, so click the link above if you also would like to not have to pay apple $99/yr for the few features of .Mac that you may like. I recommend using AFP over FTP to access your files. It’s just a better experience overall and allows you to do things like drag and drop files straight from Expression Media (formerly iView Media Pro) archives while your AFP volume is mounted. Check their directions for port numbers to use for AFP.