yet more tools for writing & groups

A trio of sites that help get ideas together.  What happens next?  That's down to you.

Springpad - This intuitive notepad app has hidden depths.  Idea capture, task management and integration with Google and Facebook.  Browser integration makes it easy to share notebooks or individual notes.  Web page capture is available.  Also supported on Android and iPhone.

TitanPad -  Fans of EtherPad may find this open-source web-based version useful.  The big draw here is that you don't need to install anything or sign-up to use it for short-term collaboration with up to 8 people.  Just open a pad and send a link - useful for editing around a document.  Doesn't play with Mac/iOS yet alas.  

Trello - A web-based virtual pinboard that lets you can ideas on boards and sequence them into 'to do', 'doing' and 'done'. Cards can be given attachments, colour coding, checklists, completion dates and voting options that can be expanded into a task management system including allocating cards to other Trello users.