Im not sure link plugins is quite the right word.
But I know a lot of blogs use things like Linky Tools or Inlinkz on memes/challenges where everyone who wants to take part can link up their own blogs/posts. So the person organising it has a list of everyone taking part and everyone else can see who is also taking part and can click on the other blogs to visit them.
I don't think the two above will work on wordpress.com because of javascript. But is there something similar that wordpress.com does support? Or even just an inbuilt feature that would do the same job?
The blog I need help with is turn-the-page.net.