Tank-FX is a website where you can upload a .wav soundclip (max 60 sec.), and get the reverb processed output back in mp3/ogg/flac format.
Tank-FX is a non-virtual effect device. The reverb is generated by a huge [11m] tank made of ferroconcrete. We put some mics and speakers in it and connected them to a unix box, so everybody can use it now from the internet. To try it out, just upload some audio material. It will be processed in real-time.
Lovely idea. Check out these examples to get an idea of the results.