Net-results is a great tool to supplement your marketing and sales efforts. With seamless integration with salesforce, you can now get awesome insights about your leads directly in your salesforce widget (email and web activity). We primarily use for email marketing and monitoring site activity but also frequently use the reporting and segment tools which give so much valuable information. Support staff is also fantastic!
There is much more capability than initially meets the eye. From drip and nurture campaigns with the ability to be as simple or complex in nature as you want to segmentation and list building, there are a lot of options and a pretty robust marketing automation system.