It looks as if Firefox Places will be disabled for Firefox 2.0. This is a disappointing turn of events, but the developers apparently feel it needs more polish before it can be let loose on the public. I've only briefly played with the latest implementation in recent trunk builds (it has since been disabled), and what I saw seemed pretty good. Live bookmarks need work, and accessing the Places window is still a little clunky. The feature set for 2.0 is still fairly interesting. Hopefully, 2.0 will be an exciting release.