Cool idea but the reason I use Google Docs is because I don't have/want Microsoft Office on my computer - and for the sharing/collaboration.
I could see this being useful for notes and the like, but I've been a loyal Simplenote user for over a year now and I can't see myself ditching it for this.
I am a beta user and a die-hard Google Docs user. I found Insynchq immensily useful when working with MS Office shops; you just tell them to install the client and they will never have to email you a document again. Edits, deletions, etc. everything is kept track of without you having to move from version to version.
I could see this being useful for notes and the like, but I've been a loyal Simplenote user for over a year now and I can't see myself ditching it for this.