Typically I open a new browser window for these sort of groups (work, fun, etc). If a tab needs to move between these ad-hoc groups then with chrome you can of course just drag it between the windows. Since I have a 3 monitor setup this is a no-brainer. The tab-candy setup would be less efficient in this regard because I have to open a third state to arrange tabs. However, if I was forced to work on a laptop this might be a better option than my current setup.