Mobile Finder is great, it's similar as Explorer on Windows. With Finder, you can access all files (and system files on your Touh). You can move, delete, copy, change permissions, etc. You must keep this app into your Touch. If someday you get troubles with some app, and you can not solve the problem through intaller.app, just go to Finder, search the problematic app, and delete it (some times it works, sometimes not).