Boris Wertz is a SaaS/e-commerce investor. LTV, CAC, ARPU, churn, etc are pretty standard metrics for those types of businesses.
Here is a good guide to SaaS Metrics: http://www.forentrepreneurs.com/saas-metrics/
Here is Bessemer's SaaS Reporting Template: http://www.bvp.com/system/files/reporting_saas.xls?download=...
The Smart Bear blog has a good series of SaaS metrics articles: http://blog.asmartbear.com/?s=saas+metrics