Hi there!
First: I think, this is a great extension, exactly what I needed - well, almost, just read on..
I found some errors when running it with Joomla 1.0.15 and VirtueMart 1.0.14.
Just after installation I had problems to get it to show something else than an empty page. The problem was, that two files (administrator/components/com_jdtestimonials/toolbar.jdtestimonials.php and administrator/components/com_jdtestimonials/admin.jdtestimonials.php) called class_exists with two parameters while it is defined with only one parameter. Commenting out the ",false" helped.
Now I see several entries in my errorlog, regarding two problems. These are (slightly shortened):
PHP Notice: Undefined property: checked_out in ********/includes/joomla.php on line 5585, referer:
********/administrator/index2.php?option...s&act=orderssent
PHP Notice: strtotime(): Called with empty time parameter in ********/administrator/components/com_jdtestimonials/admin.jdtestimonials.html.php on line 187
I might have a look at these, maybe I can fix them too.
I also corrected the german language file a little bit.
If you want me too, I can pack it together when I'm done and upload it here.
I also have some questions.
What would I have to do, to be allowed to change the code otherwise than bugfixing? I want it to not ask for a text but provide a form which allows the user to enter some data which could be condensed into a diagram, lets say a pie or other chart.
Like:
How much have you been satisfied by our service?
- VERY much
- It was great, only very small things can be made better
- I will never buy anywhere else again!
- It was ABSOLUTELY perfect!

I want the input to be saved in a database table. After this, one can count the number of inputs and create a chart from them.
Thanks for answers in advance,
Lars
Addition: I could fix the error with the undefined checked_out by changing line 133 in admin.jdtestimonials.php to look like this:
$query = "SELECT t.id, t.name, t.dtstamp, t.text, t.published
, t.checked_out, v.name as editor "
The error with the strtotime didn't reappear.