Deconstructing The Silo
The “Go-To Guy” - It seems like every office has at least one and there is certainly something to be said for a person distinguishing himself/herself in a peer group, but it can also be a hallmark of a desperate need for company restructuring or intra-department cross-training.

Compartmentalized Company
As a non-management resource, there are two positions you should try to exercise that create a bit of a split between distinguishing yourself as someone who knows enough to be considered invaluable, but who also encourages the development of a strong and well-balanced team. The first challenge is targeted at benefiting you. Be the “go-to guy” for some aspect in your area. Even if you never become an “expert,” you will lay the groundwork for becoming a more invaluable asset to your business. The second challenge is targeted at benefiting your business. Share. Use, or advocate for the establishment of a common-knowledge wiki or other form of shared knowledge base. Many businesses use these to protect, maintain and distribute information that would otherwise remain harmfully esoteric.
As a management resource, the name of your game should probably be interoperability. How well does your team play with others? Do your direct-reports have access to the extra-department resources they need to deliver the highest quality product/solution/result? Do other departments understand your function and the channels to use in order to gain access to your expertise?
Though it may seem tempting - fight the urge to silo your skills and knowledge with the aim of forcing your business to see itself as hamstrung without you. You’re a far more valuable asset as one who becomes known for the ability to effectively deconstruct and democratize what you know among your peers - allowing your business to more efficiently attack its challenges.

It is fascinating to see how much information is hoarded by individuals in industry. As a consultant I have tried to create a wiki culture within teams I have joined at several clients and I have not been successful yet. Most resources have the mentality of, owning information = job security, and they believe that posting all of the information they know to a shared wiki would be career suicide. This is a very short sighted way of thinking. Do you actually believe that helping your company will hurt your career prospects?
Executives need to do a better job of communicating the importance of information sharing to their organizations. Systems need to be setup to award and acknowledge those that contribute the most.
Could you imagine the benefit to your company of having their own internal “Wikipedia”? How much easier would it be for you to do your job if you had this type of resource?