I just finished my first version of a semi-automatic test generator for web applications. I've called it "RoboWeb" and it's now available for download from sourceforge, in hopes of it being useful to others. Reviews are gladly accepted.

Here's an excerpt from the README:

RoboWeb is a suite of Perl scripts that allow for 
recording live user browsing sequences and insert 
assertions during them to later reproduce and 
automatically verify correctness of output of a web 
application.

Recording test sequences is easy, just fire the 
roboweb_proxy script and make your browser point 
to it. The proxy will generate a test sequence
script as you browse and you can insert "must_match" 
commands in the recorded sequence by entering regular 
expressions directly in your browser's URL box. These 
commands get translated into assertions that will 
be run against the server response text when the 
sequences are reproduced, to verify that server 
responses are correct.

RoboWeb will also automatically put your web application 
backend database in a constant 'test-scenario' state 
before recording test sequences and before executing 
test scripts. This allows for reliable testing of 
complex web applications.

After you collect a number of test sequences you can 
execute them via the TEST script, which will produce 
standard perl Test::Harness output.
[download]

If you find this interesting you can download it from its page at Sourceforge.

Regards,

Gregorovius