We just added a new blog post on the OpenGamma website detailing why you should bring us in-house if you’re currently evaluating the OpenGamma Platform on your own:
http://www.opengamma.com/blog/2011/05/19/bringing-opengamma-in-house
Short story? We can provide you with all the tools you need (like market data adapters and Excel integration) to jump-start your evaluation, and we can talk to you in private about your needs to help us make the Platform better for you.