I’ve joined StumbleUpon, Squidoo, and other sites, and yet didn’t find too much improvement in my web sites. A

You can advertise here for free:
Yahoo local on yahoos home page
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http://goldbizz.localads.co.uk
http://www.trafficswarm.com/go.cgi?48605
http://www.koolplaz.com/
Post a link to your site for free where it is allowed
Examples are:
Craigslist http://www.craigslist.com
Google Base http://base.google.com
Classifieds for Free http://www.classifiedsforfree.com/…
Text Link Exchange http://www.txtswap.com/
Recycler.com http://www.recycler.com/
Yahoo Classifieds http://classifieds.yahoo.com/
US Free Ads http://www.usfreeads.com/

You can also try article submission
http://www.halooya.com/
http://www.jackask.net/
http://makemoneyforfree.wordpress.com/
http://cebucustomcomputers.adpost.com
http://www.goarticles.com/ulogin.html
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http://www.womans-net.com/forums/
http://www.articlehub.com/add.html
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http://www.articlepros.com/
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http://www.articles4business.com

Depends on how much money you want to spend. Google ads is probably the best. They place your ads on sites all over the internet, depending on the category of your site and how much you’re willing to spend for top listings.