I've been using the Ubuntu Chromium PPA builds for the last two months and as far as I can see, it all works just fine. Granted, the Delicious plugin didn't start working until a few weeks ago and I haven't yet tried any other plugin, but the developer tools are very good and those are the majority of my Firefox plugins.
How do you get developer tools working? I'm using PPA builds as well, and I have no access to dev tools. Tried launching it with some flags and still no luck. Can't find documentation anywhere :/
To get to the firebug-ish dev tools, right click and select "Inspect Element", or pull down on the "Control" menu (top right) and you should see a Developer menu.
If you hook into the Google repo, the unstable Chrome builds have "Inspect Element", but the daily PPA builds of Chromium haven't for me. As I stated earlier though, I haven't updated them for a couple of months though.