The Marketing Automation Software Guide just published a new tool they are calling the B2B Marketing Automation Active Market Map. This is a clever way to visually show where all the different marketing automation players stand out in the market.
Leaders: Marketo, Eloqua
Focused contenders: Pardot, Genius.com, Silverpop, Marketbright, Manticore
Adjacent entrants: Aprimo, Unica, Neolane
CRM gorillas: Salesforce, Microsoft Dynamics, Oracle, SAP
New start-ups: LoopFuse, Genoo, eTrigue, Alsamarketing, Act On, Net-Results, LeadLife
The map is not perfect as it is missing some vendors like Infusionsoft, RightOn Interactive, but they are planning to updating the list over time. Overall I think it is an interesting reference of how different marketing automation companies are positioned.