To interlink your posts with each other, this is a superb plugin and can be downloaded from Here
Create internal Wiki-style links in your WordPress blog. Easy to use and once you’ve started you won’t be able to live without it. Simply put [[ and ]] around a post title and it will link to the post in your blog. Also supports [[Post Title|This is a link to a post]] style tags.
This newest version fixes a bug with the complicated links where it displays Array in red instead of the post title.
