This is a tracking bug for item PLCS-001b in the Firefox 3 PRD.
*** Bug 377581 has been marked as a duplicate of this bug. ***
Not blocking on P2s, but really-really-want!
This bug is no longer valid in the context of it's filing, which was a built-in sync client for Fx3 -> WONTFIX.
Also see: http://labs.mozilla.com/featured-projects/#weave
Bug 451915 - move Firefox/Places bugs to Firefox/Bookmarks and History. Remove all bugspam from this move by filtering for the string "places-to-b-and-h".
In Thunderbird 3.0b, you do that as follows:
Tools | Message Filters
Make sure the correct account is selected. Click "New"
Conditions: Body contains places-to-b-and-h
Change the action to "Delete Message".
Select "Manually Run" from the dropdown at the top.
Select the filter in the list, make sure "Inbox" is selected at the bottom, and click "Run Now". This should delete all the bugspam. You can then delete the filter.