I was interested too and sorry that this went unanswered! So, I thought about this some too and came up with a quick list, just a mini-brainstorm.
A plug-in to your community website could allow peer-to-peer features for your users. Efficient chat, image/movie/audio sharing without touching much of your site's bandwidth.
Another plug-in might manage mod points at sites that do that sort of thing. I sometimes use mod points at
Plastic and it is difficult to keep track of how many I've used on various pages before hitting the moderate button. After hitting the moderate button, every other open page either needs to get reloaded or have the incorrect mod point count. Also, in order to actually deliver the points the page has to be reloaded, which is inconvenient. A plug-in could provide instant actions without.
Ok, that's two ideas. Basically, I'm suggesting that plug-ins could be used to alow users to communicate with each other without involving your server directly, or be used to add state to normally stateless webpages.
Is it clear how those could be of value to a site? Or are they completely without worth? If they do have worth, does it make sense that a user might switch browsers to get the worthwhile feature?
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