I'm Sure I Hate DSL

Forgive me for my hateful title DSL users. I have never had a truly satisfying experience using DSL networks. I'm currently attempting to help a colleague access his slingbox client remotely and it's becoming somewhat of a task. He can view it on is LAN, but not via the internet and I know it's an issue with DSL/router communications.
I'm a slingbox fan from WAAAAAY back (treo 650, 2 laptops,treo 700,755 and now rooted htc hero) and I was happy when Mr. Fitz got his.