security: extended-validation certificate (EV) and alerts
because security is another critical issue, specially for online businesses.
update: www.certstation.com - an aggregate of 8 alert services
Writing computer programs since 1969, here's my take on some of the fine points of this art. Currently and possibly for the next decade, the most critical issue in programming is concurrency: how to have threads safely share data and optimally use the ubiquitous multicore chips. Start with this post: Rules for safe multithreaded Java apps.