Ubuntu provides 200+ updates in 188.8.131.52
As is typical with Linux distribution point updates, the 184.108.40.206 release is really just a roll-up of updates that everyday Ubuntu users have already received (that is if they update regularly which is the default configuration). All told there are over 200 updates to Ubuntu, so if you're a new user it's probably a whole lot easier to download the 220.127.116.11 release instead of downloading 8.0.4 and then updating (it'll take some time...).
The most obvious update in 18.104.22.168 from my point of view is the inclusion of the final Mozilla Firefox 3 web browser. The original 8.0.4 release included Firefox 3 Beta 5. Ubuntu did provide Firefox 3 final as an update to users the day Mozilla made the release generally available last month.
The 8.0.4.x Hardy Heron release is a long term support (LTS) release from Ubuntu and will be supported until until April2011 on desktops and April 2013 on servers.2011 on desktops and April 2013 on servers.