there's tons of folders that I know little about and don't want to delete the wrong things. I just wasn't using anything jailbroken and the emulators, while good ports, just didn't feel right with the digital d-pad. I have like 700 MB of "yellow" space and I suspect that a lot of that is related to Cydia, etc. I've already upgraded to the latest firmware version and hoped it would wipe it out but it didn't. Has anyone developed a un-jailbreak application? Or know what files should be deleted?