Yup. I've done enterprise Rails consulting, which is almost a contradiction in terms. But it's possible and I've brought fixes like net ldap to work with AD.

Edit: Can't take all the credit, client hacked together the first version but we managed to extract it for "the greater good." Also fun stuff like XML-RPC (Xen API -> gem xenapi, VMware (gem rbvmomi)), which wasn't bad and worked OOTB. Wished MS exposed their APIs as RESTful endpoints, because WinRM + gem winrm just doesn't cut it with some products... generated powershell run by an agent instead. For some products, even having the (.someextiforgot) files that describe the API, there's no MS docs on them, so lots of trial-and-error in PowerGUI to find the right objects and methods (Yuck).