What would I lose from my system if I do a clean reinstall of Ubuntu and restore my Home partition?

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http://askubuntu.com – Sorry if this question is too open-ended. I would like to know what I would lose from my system if I decided to do a clean re-install of Ubuntu. I have a separate Home partition so after restoring that what we have been removed? All applications I have installed? Firefox add-ons? I had to make a change to /etc/rc.local to fix Wifi, will that need doing again? Thanks for any help, sorry if the answer is a massive list of potential things, I just don't know that's why I'm asking! Perhaps it would make more sense to ask, "What is saved in my home partition?" (HowTos)