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MS Comment for Joomla! 
MS Comment provides an easy to use, AJAX-style commenting system for Joomla! articles. Component also includes a simple backend administration tool to unpublish/delete comments. Support CAPTCHA, BBCode, IP Address capture. Also allows disabling comments at the article, category and section level. Limited CSS Customization is also available.
****** Coming Features/FAQ ******
*IP Banning
*CSS to customize how the comments appear on your site.
*UTF-8
*Recent Comments Module
*Allow/Disallow Comments by Section/Category/Article
*Multilingual support with as many languages as I can get translators.
We have spent a lot of time on this project and have some other things in the pipeline so the next version may be a little while coming. We'll attempt to give a demo page for the backend administration or at least screen shots.
This extension does lack features. Unfortunately, all the feature-filled commenting extensions I've seen on JED have at least one major flaw (such as needing to open the comment form in a new page or pop up). For this extension, it would be great to see a censorship system. Once I've done what I want with the css with mine, I'll send it to the dev. I think this could also do with a different css option.
However, for pure and simple comments, that open within the same page, that allows selection of section, categories and articles, is GPL, that has a sensible and user-friendly layout, I would say this is probably the best option for many.
If you want a thousand features this is not for you. If, like me, you see functionality as being key issue no. 1, then I recommend giving this a try.
Whats wrong? Theres no support on authors homepage...
It appears there is a versioning problem with PHP. IS your server running php 4?
If not, I'll take a look at the code and see what is going on there and will attempt to fix/clarify this and any other issues in the next version sometime early in the new year.
Also I'm yet to figure out how to configure the disabling of comments for a particular post or section. I tried to scour the site and also googled but in vain. Would be nice if the developer/somebody posts the solution.
I hope to have some time to put together a guide/tutorial but as this is a labor of love/learning I only have limited time.
To disable comments, you need to select the section/category/article you wish to disable comments on.
1) Select Components-MSComment->Disable Comments from the Joomla! menu.
2) To disable a section in its entirety, select that section from the first dropdown and click disable.
3) To disable a category, select the section it belongs to in the first dropdown then select the desired category and click the disable button next to the second drop down.
4) To disable an individual article, select the Section/Category as in steps 2 and 3 and then select the desired article and click the third disable button.
5) TO re-enable comments, repeat whatever steps you had to make to select the desired article/category/section and click the enable button (it should automatically change) to enable comments.
If this doesn't work, let me know what errors are occurring.
Sorry for the delay and lack of documentation but resources are limited.
Thank you for your interest in MS Comment.
But a simple, fast installation, no big frills, but it does the job!
My wishlist for future versions:
1. CAPTCHA for non-registered commenters
2. the aforementioned support for line feeds in the textarea box
3. A method for only allowing comments for specific articles, like the {comment} plugin of old...
other than that, its a great start!
Thanks for the support!
We've got CAPTCHA coming by the end of the week, I may be able to implement an editor and therefore capture some of the trouble with the linefeeds.
The problem is that some data is being truncated/modified by PHP by the time the AJAX sends it over to the Server side. I'm not sure what I'm going to do about it right now.
Not bad for two weeks of work though.
1. I entered the Website field when post a comment, but it can't be recorded if not started with http://. If the component can't recoganize URL without http://, please add a reminding message beside the input box.
2. Totally no support for utf-8: If I enter any words in Chinese characters in the Name or Comment field, they were not saved. In the backend, I can see those Chinese characters were not recorded.
3. If I pressed Enter to begin a new line in the comment, that was ignored when saving. The result is, all my comments were saved as one single line.
4. This need more features to be a mature commenting compoent: limit of Section/Category, BBcode, Smiley, and the most important one is Multi-language support!
Anyway, I should thank the author for his efforts.
Thank you for all the suggestions! I am working on most of these already but had not thought about the new line issue.
I hope to have a much-improved version 0.6a out by early September. The only reason I released it when I did was to get some feedback and that definitely worked.