Ryan,
Frozen columns is one of the TODOs in the slick.grid.js :) It is definitely something that I think needs to be added in. For the past week, I have mostly concentrated on improving performance and the ability to adjust to the browser's performance and not jump into async rendering mode prematurely. Now that that part is done, it's either working on frozen columns support, or adding another example having to do with AJAX-loading data from the server (which, personally, I think is pretty mundane and not really related to the grid itself). I guess I'll start working on the former now...
