It's taken almost a year but I think I've found a promising white-label ideablog - that is a service that lets you create your own ideablogs so you can use them to gather ideas about whatever you want. The ideablog service is called IdeaScale, it's in beta and offers a free trial account for a month.
The problem is that the business model is aggressively corporate in orientation: An account that allows up to 5 ideablogs is priced at $249 per month and an unlimited 'enterprise' account at $849 per month. That means you'll pay $500 per year per ideablog on the entry-level paid-for account. Ideablogs are not particularly sophisticated applications so this seems rather steep.
Nevertheless, IdeaScale ticks a lot of ideablogging boxes: Simple idea entry form, categorization and tagging of ideas, up/down voting, basic activity statistics, idea commenting and moderation (edit, delete etc), idea lifecycle stages (under review, in progress, completed etc). It also provides a handy administrator portal for managing categories, members, welcome emails, levels of moderation and customization of the layout of your ideablog (e.g. adding custom headers and footers).
IdeaScale administrators can choose to be pinged when a new user signs up, and when a new idea and/or comment is posted. They can also specify a points-based recognition system that awards a set number of points for posting an idea, posting a comment on an idea or voting for an idea. IdeaScale ideators can use a My Account link to keep track of their own ideas and the engagement they have stimulated (i.e. voting/comments) and if you are interested in an idea you can elect to be alerted by email as it develops momentum.
Social networking is an important function of all ideablogs and IdeaScale offers a number of useful features to ensure that your ideas get the exposure they deserve. There's a blog widget so you can quickly add an idea from an existing blog and a blog feed that can feed the latest ideas to a blog in addition to a standard RSS feed. Integration with Twitter is also provided. Multiple levels of interaction authorization mean that you can lock-down your ideablog or open it up to anyone who wants to post an anonymous idea.
As with every beta there's inevitably a few bugs. I posted an idea, then deleted the category it was attached to so now the idea is inaccessible. There's limited reporting at the moment but this is clearly an area that IdeaScale will be paying attention to. I think this is a very promising ideablog service that has all the basics of ideablogging well-covered. It's too pricey for individuals or probably many small businesses and non-profits, which is a shame, but at least if it succeeds attracting core business users at the current plan pricing levels, you know IdeaScale is likely to be around for a while.
So if you've got any ideas about the future of screenwriting please get over to IdeaScale, click the big orange New Idea button, signup as a user and post your ideas to my ideablog - What Happens Next?