I am in the same boat, but I have found how to download the videos - it's just
not automated through WinHTTrack. Run URL Snooper and in advanced mode, filter
the results to show only f4v under Show All. 

<http://files2.lynda.com/secure/courses/59957/f4v_H264/59957_01_01_MM01_intro.f4v?hashval=1284337151_8cb906ee774516bb1c9c290ed46a065e>
<http://files2.lynda.com/secure/courses/59957/f4v_H264/59957_01_01_MM01_intro.f4v?hashval=1284337188_b69009ae9e24221b400250d398d9a832>
<http://files2.lynda.com/secure/courses/59957/f4v_H264/59957_01_02_SC12_WhatisAE.f4v?hashval=1284337188_2154b7364174fc4db85c3839c02e9c66>
<http://files2.lynda.com/secure/courses/59957/f4v_H264/59957_01_01_MM01_intro.f4v?hashval=1284337196_898afcd056baf99ce5bbab6acf00f97b>
<http://files2.lynda.com/secure/courses/59957/f4v_H264/59957_01_03_SC12_exercise.f4v?hashval=1284337197_0d9f4429a455542261ff895e376aa1a7>

I believe the way Lynda is set up is each video has a has hash value that
works for a limited amount of time, so you cannot save a list of URLs and
access it later on (and expect to get them all at once). The list above
doesn't work for me anymore, but it did at one time in order to access the
video.

Can WinHTTrack view hidden URL's? I can only find this URL with other
software.

I'd like to be able to see the hidden URL's in HTTrack, and mirror download
them (having it climb around in my specified pages).