Running the attached csv_test.py under Python 2.4.2
(Windows XP SP1) produces:

>c:\apps\python24\python.exe ./csv_test.py
['one', '2', 'three (line 1)\n(line 2)']

Note that the third item in the row contains a newline
between "(line 1)" and "(line 2)".

With Python 2.5a1, I get:

>c:\apps\python25\python.exe ./csv_test.py
['one', '2', 'three (line 1)(line 2)']

Notice the missing newline, which is significant.  The
CSV module under 2.5a1 seems to lose data.