Twitter Site Script. Seeking New Ideas

I am seeking new site ideas for Twitter. If you have worked on and or have any scripts already for Twitter web based softwares, then please post a demo. I am out for new ideas and investing to get new web sites out there. I know a bunch of you have developed a Twitter script already or have one that you can sell. Please PM with a demo of any twitter script that you have that you will be willing to sell for a good price.