I've found my lenses that contain good solid original content hold their own. Whether it be traffic from internal Squidoo searches or have been indexed by Google.
Has anyone had luck with exchanging lensrolls?? It's like exchanging blogroll links. Your lens shows up on the right hand side of the page under "More great lenses"
Not much, I find that most if not all of my traffic is from Google. I've layed off of Squidoo with the affiliate sale based lenses because it seems to be getting worse - 90% of my 6-month to one year old lenses have PR0 now, and I doubt it's because of an upcoming update. It's still a traffic source for your websites (kind of). If it could actually get a mediocre PR, it would be good link juice.