For those who have been eagerly waiting for a new updated release for google gears to work with firefox 3.5 in windows , linux and macs, i have a good news for u guys.
Geza Kovacs , developer, has developed some custom versions of google gears to work with firefox 3.5. Go here for downloads
For me, the new gears works very well with gmail offline and wordpress. I am using ubuntu 9.04 with ff3.5. See the screenshots below.