Trying to put together a comprehensive list of all .NET-based O/R mappers, because I get asked all the time. Sorry, but I'm not going to include any comparisons or analysis -- you're on your own.

• Codus (Free)
• Codesmith (Free/$)
• CSLA (Rocky Lhotka) (Free)
• DataObjects.NET ($$)
• Deklarit ($$)
• EntityBroker (Free/$$)
• Genome (Free/$$)
• Gentle.NET (Free)
• Ironspeed ($$)
• LLBLGen Pro ($)
• Modularis ($$$) 
• Neo - .NET Entity Objects (Free)
• NHibernate (Free)
• NPersist (Free)
• NOrca (Free)
• ObjectMapper ($)
• Objectz.NET ($)
• OPF.NET ($$)
• ORM.NET (Free)
• RapTier (Free/$$)
• Sooda (Free)
• Visual Developer ($$/$$$) 
• WilsonORMapper ($)
• XPO - Express Persistent Objects ($$)

Did I miss any?