I'm planning a new NOI implementation, would I be better building a separate DB2 Server or build DB2 on the component Servers themselves?  Can DB2 Workgroup Server Edition 10.5 be Clustered and are there any restrictions on its use?

Well, if you’ve enough h/w resources, it doesn’t matter whether you deploy on one server or distribute them. If its test/dev environment, you can opt for single box….but if its for Prod, I would opt for Best Practices which also suggests having dedicated DB2 host. I had presentation a while ago on Network Mgmt focused, you can see some specifics @   https://ibm.biz/BdZBhc.

You may also find NOI best practices guides handy @ https://ibm.biz/BdZBhd and if you want to include Disaster Recovery(DR) and/or High Availability(HA) into consideration, then the discussion goes little further. Oh, and I would recommend DB2 11.1 Enterprise Edition (as some products require table level partitioning feature) along with latest fixpack (fps can be found @ https://ibm.biz/Bdiuya ) instead of 10.x and as a NOI customer, DB2 comes free. Good luck.

Thanks, some excellent information in there