Quick answer: Compare Squidoo to any blog or article directories that allow you to share their readership (via commenting and perhaps, guest posting) - you'll have the answer. I had written a detail guides on web marketing with Squidoo on my blog, would appreciate if you guys can have a look and let me know what you think about it: http://soufulow.com/online-biz/how-can-squidoo-bring-in-more-traffics-for-you/ Have a look on its Alexa traffic graph... though Alexa is kind of biased but it does reveal part of the truth isn't?
They might rank well, but I read else where that people just don't click on the links that they tend to just ignor them. So as a marketing tool it seem that it's not worth using?