Checkmyreference.com
Offers three levels of service depending upon the amount of information being researched.

Documented Reference Check
Uses certified court reporters to check employment references, so you can learn what former employers say in the form of a document admissible in court.

Employment Reference Check Associates
Providing job seekers with a confidential, professional employment reference checking service to confirm the accuracy of job references being given by former employers.

Employment-reference.com
Reference checking services.

Interfolio
For applications that require more than just a resume, create an online portfolio of your best work.

Just Checking
Performance reference check service for positions with annual earnings greater than $50,000.

Reference Depot
An online reference checking and references storage service for job seekers, employers, recruiters, and human resources personnel.

Reference Letters
How to request references and how to write them.

ReferenceNow
Allows applicants to bring their credential file or dossier online. Give employers or graduate schools instant access to recommendations, writing samples, transcripts and references.

References-etc
Offers employment and rental reference checking services for job hunters who suspect a bad reference. Offers credit reports and driving records.