Now that Xamarin and Microsoft are working towards PCL support across platforms, can you please see what you can to do get a single Rx package put together with PCL support for Xamarin? The current Rx PCL's don't support Xamarin and the Rx version in the component store has a different strong name. That means we can't use them in a PCL that targets everything.
This has downstream effects too, as common frameworks like ReactiveUI have a dependency on Rx. As there's a "mono-Rx" and a "MS Rx," ReactiveUI can't itself create a PCL.
It's critical this get nailed down asap - Rx is open source and in a git repo on Codeplex (http://rx.codeplex.com/) and they accept pull requests. Xamarin should be able to supply the necessary changes for proper support.
Thanks