Look right… I just added the Simple Recent Comments plugin by George Notaras to the sidebar of the NPT blog.
The plugin is available for download through the link above and is easily configurable. For example, the default arguments call for 7 comments limited to 50 characters and I changed that to 5 comments limited to 70 characters.
To install it on your blog, download the plugin's zip file, unzip it, upload to your wp-content/plugins folder and activate the plugin in WordPress. Then place the following code –
< ?php src_simple_recent_comments(7, 50, '', '') ?> in your sidebar. The 7 and 50 indicate the number of comments and number of characters respectively.