My current project (for a large health care company) involves three AI components (a semantic network, and reasoning system based on PowerLoom, and a module using probalistic networks).

We are in a hedge our bets mode, basically using three promising approaches - I can not talk too much about the application domain, but it will be useful to see which approaches end up being most useful.

BTW, I have written about this on my regular web blog, but the release of a new version of PowerLoom under liberal open source licensing (that is, commercial use OK) is a great addition to anyone's 'AI toolkit'.