Miracle Labs creates public experiments around subtle innovations that (a) help the world and (b) have high benefit-to-cost ratios by leveraging modern technology and trends.
Experiment status: Launched
Overview: ErrorHelp.com has quickly become the world leader in error search. Users search the site (or the Firefox extension) to find solutions to their error messages. They're given a list of solutions submitted by other users for that error. If no one posted a solution yet or the existing ones don't work for them, that user is reminded in 48 hours to share their answer to help out.. In this way, we coax humanity to avoid solving the same errors again and again. (This service was previously known as bug.gd.)
Coverage: ErrorHelp and bug.gd has been featured on numerous websites (including TechCrunch, LifeHacker, Mashable, CNet Webware, Digg, Killer Startups), radio talk shows, and magazines such as PC World where bug.gd was named one of 2008's 101 Fantastic Freebies. More information is available on bug.gd's FAQ and blog.

Experiment status: Public Beta
Overview: Yumbunny is an innovative crowd-sourced matchmaking site. Users upload a picture of themselves and then post their widget to their blogs, signatures, MySpace pages, etc. Friends, family, and strangers then match up users with the widget. Each week, users get an email telling them of their top matches and have the option to contact their matches for a small fee.
Coverage: Yumbunny is still creating a buzz amongst the tech and social networking world. It has been covered so far on TechCrunch, KillerStartups, Thrillist, AltSearchEngines and various blogs.
Experiment status: Public beta
Overview: We created featurelist.org to encourage users to suggest new features openly. For most companies, suggestions are lonely, individual things that quickly get lost in email or customer support queues. We want suggestions for our applications to be tracked in the open so that users can build upon each other with new and exciting ideas.
We've now opened featurelist.org to the public so that any project can track feature requests hosted at http://featurelist.org/YOURPROJECT. We hope to keep featurelist.org free and ad-free to help the online startup community meet their user's needs. Recently we've added custom widgets for managing raw feedback from users and we'll be enhancing the service over time. (Suggest more features)
Coverage: Our featurelist.org experiment has only been announced in some circles, but through word of mouth it has been included on blogs such as ReadWriteWeb where it is already being discussed as a peer to companies that have invested millions behind similar initiatives.
Experiment status: Public Beta
TinyArrows and Rims are URL shrinking services which produce the shortest URL redirects in the world. TinyArrows supports unicode domains and URL suffixes to guarantee you'll have the shortest links on the block. Users of the service can even hand-pick their own URLs and track their statistics as people click on the links.