Nirvana - a promising GTD solution

I've just spent 20 minutes playing around with the web-based Nirvana GTD service.  It is build around the principles of the Getting Things Done (GTD) system and, although it is still in beta (invite only - mine took about a week to come through from requesting one), I like it.  The interface is clean and simple while following the GTD basics of separating tasks and projects.  It responds quickly to creating new tasks and projects.  At the moment you cannot attach files to projects and tasks and that is annoying but it looks like that is in the pipeline.  You can email tasks in which is good.

Do I prefer it to Toodledo as a task manager?  Yes and no.  I prefer Nirvana's clean interface and the clear distinction between tasks and projects but not being able to attach files means I'll probably stick with Toodledo for the moment.  Pricing will also be a factor  - Toodledo is pretty cheap ($30 a year) for a premium account.  Nirvana is planning to introduce a freemium model but the prices have not yet been set.

If they introduce file attachments, have an Android app and don't charge too much I'll probably make the switch.  

UPDATE - I take back my comment about a need for an Android app - it works very well on my phone web browser.