Joomfish is a good solution but it has some weaknesses in my opinion:
1- It is not a user-friendly one. Difficult to understand some parts. UI could be integrated to the core Joomla.
2- There are 2 tables in DB and all records are stored mainly in the table jos_jf_content thus creating a huge number of raws for a single translation, say a menu item. In my case I have skipped some but I have 4 records for a menu item translation. I have not tried a content item buty it may be bigger than this. So this kind of approach will result in a huge db in no of records and size. This table can be splitted to a number of tables as it is in Joomla.

I have installed both plugins to use reCaptcha with my contact form but contact form can't show the captcha from recaptcha.net. The contact page shows blank white boxes under the contact form.
Using Firebug I can view the captcha image in HTML code of the page.

This module offers flexibility in article presentation but SEF links are not that way Joomla 1.5 offers.
Links are in the following way.
http://localhost/component/content/article/583.html
They propagate the right article though.

The plug-in is very simple to use. Interface is very nice but I get the following error message on the pages where thumbnails appear:
Notice: Undefined offset: 5 in /mysite/mambots/content/plugin_jw_sig.php on line 59