Thus every error that is merely annoying in a personal or topical page is deadly in a corporate page. Fetch any two or three such lists, and sweep your site for common mistakes. For every common error you've allowed to creep into your site, subtract not just readership, but revenue. Test Before You Post Multi-billion dollar software megalopolies in Redmond may be able to get away with posting a technically dismal Web page. But you probably can't.
Testing is a vital part of developing and deploying an effective corporate Website.
It is axiomatic within software quality circles that developers simply cannot test their own work effectively. Your testers must be free from the embedded assumptions and cherished preconceptions of your design and development team. Bring in testers from a temporary employment agency if you must, but subject your site to a rigorous workout before you post it. Whether you're a potential client, a prospective employee, or merely an idly curious passerby, it's a genuine joy to encounter a corporate site that is both well-designed and artfully crafted. You know something about its people.