Through necessity, I have created an online tool that will generate an RSS feed using the official YouTube RSS format for a large majority of YouTube video pages. Not all pages are guaranteed to work, but the generator will do its best! I made this for an aggregator of my own, but if anybody finds it useful, I would love to hear about it!
Usage:
http://tysonc.net/yourtube/rss.php?p=YOUTUBEURL&n=TITLEOFRSSFEED
Examples:
http://tysonc.net/yourtube/rss.php?p=http://youtube.com/browse?s=ms&t=m&c=0&n=Most Responded This Month
http://tysonc.net/yourtube/rss.php?p=http://youtube.com/results?search_query=tenacious+d&n=Tenacious D Videos
So I've resumed work on my YouTube client like application.
Here's some new screenshots:


As you can see, it uses YouTube's player for streaming video. But, I've written my own player for all local files. It supports quite a large array of formats as of right now. Downloading YouTube videos and converting them to a portable format is really easy with this application... just click on the iPod button at the top and a wizard will facilitate the operation. You can then go back to playing local media or watching YouTube videos while the videos download and convert themselves in the background.
This program needs a new name and a logo. Help. :P
I've finally been inspired to work on some new software.
I read about 'Tubular,' which is a Mac application that acts as a 'client' to YouTube, enhancing the experience. I was interested after hearing the features that it offered but was disappointed not to find a Windows version, much less a free version for any platform. So, I started coding my own. ;)
I'm planning on using ffmpeg for conversion of the YouTube videos. So, it will offer a tremendous amount of compatible file formats, including those for portable devices such as the video iPod and the PSP.
Anyway, I've put a few hours into it and got the following:

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