A "summary" field that can concat strings from other fields.

Actually what I am heading for is a way to assign a Work Item to several persons, but not to a group. You could have the responsible person - "Assigned to", but also participants. When querying for My Work Items, I should also get all that I am a participant.

I looked at the Review Work Item, and had an idea to do the same for Participants, but on the first page you need to see the information, and that is the reason for the "String concat field". For example this could look something like this:

John Doe;Bill Gates;Rob Caron

It is a good idea and this would be simple to build. We could also have a formatter control where a string format can be given such as "{0}: {1}, {2}" (in the form that String.Format's first param expects), and the fields for each param can be provided. Both are easy to build, so i'll add it to easy category.