Review my startup, colaab - A Silverlight 2 RIA for rich, real-time collaboration
jawngee: Well to start, rethink the EC2 web serving, you're spending more money than you need to.  Consider linode or slicehost as bandwidth is way cheaper than amazon.Second, why silverlight?  The whole idea of online collaboration is allowing as many disparate people come together regardless of device.  So you've thrown up roadblocks to two platforms that can no longer be considered marginal (OS X and Linux) for what is an arbitrary technology choice.  At least with Flex you'll hit 98% of it and you can't sell me that silverlight has any advantage over Flex that is worth that.I'd love to give you more feedback because I'm very interested in online collaboration, but I can't because I'm on Linux and won't install SilverLight on my mac.