Hey everyone,
I am pleased to inform you that I completed (for now) building an RPG pitch database website. It goes by the most imaginative title of RPG Pitches [2]. 
[2]
It was inspired by me collecting a long list of pitches of games in private for a regular one-shot game night. I would like to make this useful for everyone.
The concept of the site is simple, depending on what you want:
Find a pitch for my game to make it interesting to my players
Go on the website, select your game/system in the main view (it's a dropdown menu) or visit the Systems page to scroll through the full list.
You can select by language (currently only German and English) and by pitch type to quickly filter the list of available pitches. By default, they are sorted by rating, to make things easier for you.
That's it, you might just have found the pitch you need to start that game off!
Also, please don't forget to vote on the pitches to help your fellow gamers! 
Add a pitch you really like
For this, you need to log into your account.
Then, you can just click on the corresponding pitch type in the left sidebar to create a new entry. Enter a title to distinguish yours from other pitches, select a language, name the system (auto-completed if known) and write your pitch down. Don't worry if your system is not known to the site, yet. We'll take care of that.
Hit "save". That's it, you've just contributed another awesome pitch. Thanks for making this site better and more comlete! 
Browse for interesting games
Sure, why not "abuse" the site for this. Just hit "taglines" and your favorite language(s) in the main view and off you go! The system pages might have additional information and links for the game system.
Again, don't forget to make everyone happier by voting.
I hope you like the site and find it useful. Leave me some feedback if you do (or don't). May it be of service to all of us.