The UI design has been frozen. I need a couple more tweaks and it will be completely designed and coded. Here's a screenie of the UI having a directory as the source, and the split by line splitting strategy selected:

I created a new forum group just for Text File Splitter. I already posted a Visual Studio template to create new file pattern tokens on the File Patten Tokens forum. This will install a generic template in Visual Studio 2008, for people who want to create custom tokens. It will look like this once it is installed, from the Add New Item menu:

I will be doing the same for File Splitting Strategies very soon.