Since a majority B2B early stage prospects visit web sites anonymously (not filling out a form), it would be great to track these activities by Company, perhaps reverse IP address lookup that commontly identifies a corporation.
At many companies I've been with, our reps are extremely interested in knowing if people from COMPANY ABC are visiting our web site and what pages. There's a direct correlation between multiple anonymous hits to our web site and active/pending initiative that we're being considered for. We want to get in front of these companies or reach out to someone we have a relationship with to identify that initiative.