Which groups should I normally belong to?

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http://askubuntu.com – I accidently removed my user name from most of the groups it belonged to. I indeed miswrote sudo usermod -aG agmenor agmenor by forgetting the -a option. I found this question to add myself back to the sudoers group, which I'll do at my next reboot. But after that, what other groups should I also add my user to? I know it depends largely on the programs I have installed; for example I should belong to debian-tor if I have Vidalia installed. But what are, at least, the groups I should belong to as if I was on a fresh install? For instance, on another machine, the command groups returns agmeno (HowTos)