It would be nice to shorten the breadcrumbs display using Trac syntax for report and changeset. Also only shows just the filename instead of full browser path. Here's a quick patch.
breadcrumbs.py:
148 if realm == "ticket":
149 name = "#" + resource
150 elif realm == "report": # report:7 is {7}
151 name = "{" + resource + "}"
152 elif realm == "changeset": # changeset:10 is [10]
153 name = "[" + resource + "]"
154 elif realm == "browser": # browser:/trunk/foo.py is foo.py
156 name = resource.split('/').pop()
157 elif realm != "wiki":
158 name = "%s:%s" % (realm, name)