Anybody who contributes a feasible idea or suggestion will receive a premium account indefinitely, free of charge. And yes, before anybody asks - our primary offering is free (we'll be offering a few premium only features in order to ensure financial stability).
So, any suggestions? You can see a screenshot of our web ui at http://i.imgur.com/vxqhcgO.jpg - and you can sign up for the beta (invites will start going out tomorrow) over at http://yomu.eu/ if you're interested.
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For those interested, our technology stack currently consists of the following.
Backend
node.js (express, socket.io, the usual suspects).
Database
NuoDB (formerly NimbusDB).
Why NuoDB over say MySQL or Mongo? Well, I've personally been working with Nimbus for a while - and I love the damn thing. Performance is great, and the ease of scaling is a major selling point.
Hosting
Self-scaling Amazon EC2 infrastructure.
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Applications for Android and iOS are already on the roadmap, and are tentatively scheduled for late July.