Official OS 184.108.40.206 For Pearl (8100,8110,8120), Curve (8300,8310,8320), 8800 and 8820 from Hutchison
on 1 Jul 2009 08:31 am EDT
Odd, just last month on June 1st there was a similar device wide release of device firmware across the board where OS 220.127.116.11 showed up - now this month yet again, on the 1st of the month another huge list of upgrades comes out. Maybe there's some food for thought there.
In any event, 18.104.22.168 has been released for all "older" device from Hutchinson and as such are of course official OS releases so if you are looking for the latest and greatest in the 4.5 flavor be sure to grab whatever one matches your device.