What about installing the plug in on my windows xp installation that is on my Parallels for Mac virtual machine? I realize it won't be HD (my MBP's core 2 duo process is only 2.33 Ghz so it wouldn't do HD anyways, so I'm not missing anything), but theoretically that could work just to get a watchable picture on my macbook with 10.4.11, right? Thanks!
Since your MacBook Pro using 10.4.11, you won't be able to use the Web-Based SlingPlayer, however you can download the SlingPlayer Desktop and view it that way.
Check out this links in order to get the system requirements and to download the application.
I hope that helps!