This is a list of freemium products with pricing pages so you can easily compare and learn from them:

• BaseCamp http://basecamphq.com/signup
• CentralDesktop http://www.centraldesktop.com/pricingmatrix
• CheckDog http://checkdog.com/plans.php
• ClickTale http://www.clicktale.com/pricing.aspx
• CrazyEgg https://crazyegg.com/pay/plans
• FreeConference https://www.freeconference.com/Services.aspx
• FreshBooks https://secure.freshbooks.com/pricing.php
• GetSatisfaction http://www.getsatisfaction.com/plans
• GoToMeeting http://www.gotomeeting.com/fec/gotomeeting_pricing
• MailChimp http://www.mailchimp.com/pricing/
• Mimiran Sales Compass http://www.mimiran.com/pricing-signup/
• PollDaddy http://www.polldaddy.com/signup/
• Prefinery http://www.prefinery.com/pricing/web/
• QuickBooks Online http://quickbooksonline.intuit.com/finance-accounting-solutions/  
• Ronin http://www.roninapp.com/site/signup  
• Skype http://www.skype.com/intl/en-us/prices/
• Survs http://www.survs.com/pricing/ 
• Twilio http://www.twilio.com/pricing-signup
• UserVoice http://uservoice.com/signup?ref=nav
• YouSendIt https://www.yousendit.com/cms/compareaccounts
• Webex https://buyonline.webex.com/US/pages/BuyMeetingCenter.html
• WorkingPoint http://www.workingpoint.com/pricing-and-signup/
• Wufoo http://wufoo.com/signup/