My Experience 

• Update often with new and interesting content. Add a new book review, a new Flickr module, etc. The update increases you lens ranking and visitors are more likely to return if they know you make frequent updates.
• Connect with other lensmasters. There are links to featured lensmasters on Squidoo's homepage. Contact them. Complement their lenses and they will probably at least look at yours. Then if they like what they see they might give it a five star rating, put it on their favorites list, and/or link to it. Every one of the top lensmasters I've emailed has responded, usually within a day. (I don't respond that fast to my family's emails.)
• Blog about your lens. Anyone who reads your blog may then clickthough to your lens. Any visits and exposure is good. Don't forget to self-ping (that sounds nasty.) Squidoo registers the trackback ping which helps your ranking. (It looks like you can ping your own lens every other day. I'm sure they did that to prevent self-ping-abuse.)
• Email your lens to everyone you know. There is an email link on every lens which allows you to email it to someone. Squidoo processes the email and records it in the lens' statistics. I'm not sure how much this helps your ranking but it will at least increase your exposure and visits.
• Participate in the forum at SquidU. You can get and give good advice. Remember it is a community and the more help you give the more help you will receive.
• Don't publish your first draft. The first impression people get of your work might be a visit to a lens that is under construction. My current rule of thumb is to not publish a lens until I've worked on it at least three days.
• Start a prelaunch marketing campaign. It will add to the publicity and create curiosity. Yaro Starak has done this with Blog Traffic School. It a blog about his yet to be published online course. Its works. I signed up for his newsletter and am already considering what I would be willing to pay for it.
  
  Speaking of prelaunch publicity, I'm working on a lens called Jo Rowling's Favorite Charities.
• Submit your lens to be Lens of the Day. If its posted as the lens of the day you'll get a lot of incoming traffic. If its not, at least Heath and/or Megan will look at it.

Other Lenses 

Lens on Lens

An excellent lens about lens construction. David Soul gives a lot of excellent information about design, cross linking, etc. It is also an excellent model of good lens design, including links within modules that go to other modules. (An excellent idea for a large lens.) Click above to see an informative, and elegant, lens.

Put Your Site on Steroids

Another excellent lens about Search Engine Optimization (SEO). Includes information about keyword selection and placement among other topics. There are also links to a number of other helpful sites.

Books about Web Site Promotion 

Squidoo-It-Yourself 

Add Links From Other Lenses to Yours

Squidoo is very much about community. The more links there are within the Squidomain the more people will move through it to find what they are looking for. More relevant links will also improve your SEO.

Original Content Trumps Copy and Paste

Richard suggests using an RSS feed module to keep your lens both fresh and original. You can also put other things you've written into a lens. . . or if its too long you can put in an introduction.

Content Relevancy is Key

"When it comes to Squidoo lenses, it would appear that more content is better for your ranking. There is a practical consideration here, but as with all websites and blogs - relevancy is the key." I have already visited top ranked lenses with too many links. I think my attention span is about two screens. More than that and I'm moving onto a different lens.

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