I am not sure if this has been posted here or not... But what the heck.
This has to be the most promising Google Toolbar I have seen for Mac.
Could a PR be coming soon? Pagerank seems to be the only major feature I see missing - It would be nice if Google would allow PR to be added to the application. Most the work is already done for Google to allow for a Mac copy of Pagerank. However, it may be a while since Google keeps tight control on their PR.