Szkandy

Simple plugin wich allows you to Translating wordpress pagination URL (from “page” to anything else). 
After activation the plugin, you can set your pagination on Permlainks page.

Pagination Translator

Simple plugin wich allows you to set your pagination name in URL.

mg12

AJAX paging plugin for comment pages in WordPress 2.7 or higher versions.
为 WordPress 2.7 的评论分页功能增加 AJAX 处理.
Features:
<ul>
<li>AJAX comment paging</li>
<li>Without any JavaScript framework</li>
</ul>
Demo:
http://www.neoease.com/themes/
Supported Languages:
<ul>
<li>US English/en_US (default)</li>
<li>简体中文/zh_CN (translate by <a href="http://www.neoease.com/" rel="nofollow ugc">mg12</a>)</li>
</ul>

AJAX Comment Pager

AJAX paging plugin for comment pages in WordPress 2.7 or higher versions.

Pagination Translator vs AJAX Comment Pager