1. One requirement I forgot to mention about the 'business requirements' tab is to have a column for external links. some testcases relate to a use case which typically written by business units and uploaded to some location (network location, sharepoint, wiki etc). It would be helpful to click on this link and be directed to where the usecase or some other relevant document is.
2. Regarding bug tracking, we were initially using bugzilla but a lack of cool graphs made us switch to Microsoft Team Foundation Server. Notice the emphasis on 'cool' graphs

We have not quite made the transition yet to TFS and have to figure out how to port soapUI testcases to TFS. I am currently playing around with their SDK to see how it works. So at the moment there is no link between a testcase and a bug.
Thanks
Ali