Cool Ideas for Advanced Alert Campaigns Anyone?

Hi all,

Do you have any cool ideas for advanced alert campaigns (alerts for sales)?

Something beyond "person visited pricing page" but more along the lines of targeted account visited 5 pages in 1 hour, a person in an advanced funnel stage (not won) visited X blog post pages. 

I'm sure this is basically endless but I am interested in hearing some great ideas that you tried before and found to be helpful.

Thanks!