RSS feeds from other projects in timeline
InsideTrac provides a plugin that allows you to read RSS feeds from other projects in your timeline.
It also provides a GreaseMonkey script that allows you to easily create a ticket in your trac instance that references an existing ticket in another site. Currently supported sites are SourceForge.net, BitBucket.org, and any site running Trac. It does this by providing links on the ticket listing pages of these sites that link back to your own instance.
Future versions will provide better integration, allowing you to update remote tickets directly.
If you have any issues, create a new ticket.
Download the zipped source from here.
Installation instructions and examples are posted at the project's home page.