Ryan

Adds a shortcode, series-tag, that you can use to create a list of all posts 
that are tagged with whatever tag you pass in.
Series Tag was written to allow you to tag a series of posts with the same tag, 
and then easily link between them without having to manually create links at the 
bottom of each post.
Links are created in date published order starting at the earliest date. All post 
titles are links to the permalink of the post except for the current post which just has its title displayed.
For help or more info, visit <a href="http://www.nutt.net/tag/series-tag/" rel="nofollow ugc">Nutt.net</a>

Series Tag

Adds a shortcode so you can easily create a list of all posts with a specific tag. Written to make it easy to link between a series of posts.

azurecurve

Displays Index of Series Posts using series-index Shortcode. This plugin is multi-site compatible and contains an inbuilt show/hide toggle. The shortcode can be used on posts and pages; the format of the index and other options are user configurable through an Admin page.
Two custom fields (Series and Series Position) need to be added to each post in the series; these fields are used for selecting the posts and ordering them when the index is displayed.
Shortcode [series-index] is placed in the post where you want the index.
Shortcode [series-index-link] can be used in a post to link back to title post.
This plugin supports language translations. If you want to translate this plugin please send the .po and .mo files to wordpress.translations@azurecurve.co.uk for inclusion in the next version (full credit will be given). The .pot file is in the languages folder of the plugin and can also be downloaded from the plugin page on http://development.azurecurve.co.uk.
Current translations: 
Serbian (sr_RS) translation by Borisa Djuraskovic of <a href="http://www.webhostinghub.com/" rel="nofollow ugc">Web Hosting Hub</a>

azurecurve Series Index

Displays Index of Series Posts using series-index Shortcode. This plugin is multi-site compatible and contains an inbuilt show/hide toggle.

Series Tag vs azurecurve Series Index