EXPERT RESPONSE
Generally, I'm a fan of the "buy vs. build" philosophy, and I recommend the use of commercially supported products in enterprise environments. In most cases, it's simply more cost-effective to use a product that has manufacturer support available. Many administrators find the notion of calling for support a blow to their egos, but that's a misguided philosophy; technical support should be viewed as a direct pipeline to expert knowledge, rather than a last-ditch 911 call.
Some organizations, like schools and other non-profits, may have volunteers available to spend time maintaining a system, or simply don't have the funds to purchase and maintain a commercial IDS. In such cases, building an intrusion detection system may be a viable option.
If you do choose the "build it" route, go with a mainstream tool. Enterprises around the world, for example, deploy the open-source Snort IDS. The intrusion detection system's rule updates are available for free, but with a 30-day delay. If you're willing to spend a few hundred bucks a year, however, you can purchase a real-time rules subscription. There's also a huge community that provides a free support resource through forums on the Snort Web site.
More information:
Check out SearchSecurity.com's Snort Intrusion Detection and Prevention Guide.
Learn how to use wireless IDS/IPS.
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