You know that YouTube video that you can't stop showing to your friends over, and over, and over again? Tired of downloading it every time? Wouldn't it be great if you could just save that YouTube video permanently on your iPhone? What about when you're away a WiFi hotspot and you want to show off that video in full quality, not the degraded EDGE version? Well, now you can.

These are just a couple of scenarios when being able to convert and save YouTube videos for the iPhone comes in handy. Zamzar.com, a free online file conversion service, recently introduced an option to convert videos directly for the iPhone, including YouTube videos.

Converting a YouTube video for the iPhone using the service is painfully easy. Simply paste in the URL to the YouTube video into Zamzar's URL page, choose "iphone" as your output format, enter your email address, and off you go. Zamzar will download the YouTube video to their servers, convert it to iPhone's required format, and email you a link where you can download the file (usually within 5 minutes, depending on how busy their servers are).

Not only will Zamzar convert YouTube videos for the iPhone, it will convert avi, flv, gvi. m4v. mov, mp4, mpg, rm, rmvb, vob, wmv. Zamzar will convert any file up to 100MB.

As an added bonus, your converted video remains available for download for 24 hours. During that time, you can spread the link around to other iPhone video junkies.